I have an editable GridView but I would also like to have an add new row functionality, so I made a button using FooterTemplate for all editable fields and set CommandName="AddNew" . Everything looks as expected on the front end, but Add New Row cannot find txtGrantId, txtPotId or txtBudget at all and throws System.NullReferenceException 'Object reference not set to an instance of an object.'. The issue has to be in the code behind, but I am attaching the front end as well. The data source is pretty long but it does call OnRowCommand="gvPotsMoneyGrants_RowCommand"
ASPX
<%--Primary Key LinkId--%>
<asp:TemplateField HeaderText="LinkId" SortExpression="LinkId">
<ItemTemplate>
<asp:Label ID="lblLinkId" runat="server" Text='<%# Eval("LinkId") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<%--GrantId--%>
<asp:TemplateField HeaderText="GrantId" SortExpression="GrantId">
<ItemTemplate>
<asp:Label ID="lblGrantIdMain" runat="server" Text='<%#Eval("GrantId") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGrantId" runat="server" Text='<%#Bind("GrantId") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inGrantId" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vGrantId" runat="server" ControlToValidate="inGrantId" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
<%--PotId--%>
<asp:TemplateField HeaderText="PotId" SortExpression="PotId">
<ItemTemplate>
<asp:Label ID="lblPotIdMain" runat="server" Text='<%#Eval("PotId") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtPotId" runat="server" Text='<%#Bind("PotId") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inPotId" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vPotId" runat="server" ControlToValidate="inPotId" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
<%--Budget--%>
<asp:TemplateField HeaderText="Budget" SortExpression="Budget">
<ItemTemplate>
<asp:Label ID="lblBudgetMain" runat="server" Text='<%#Eval("Budget") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtBudget" runat="server" Text='<%#Bind("Budget") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inBudget" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vBudget" runat="server" ControlToValidate="inBudget" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
Code behind
protected void gvPotsMoneyGrants_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox txtGrantId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtGrantId");
TextBox txtPotId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtPotId");
TextBox txtBudget = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtBudget");
string GrantId, PotId, Budget;
GrantId = txtGrantId.Text;
PotId = txtPotId.Text;
Budget = txtBudget.Text;
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("GrantId", GrantId);
cmd.Parameters.AddWithValue("PotId", PotId);
cmd.Parameters.AddWithValue("Budget", Budget);
}
}
Please, try the code below.
protected void gvPotsMoneyGrants_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox inGrantId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inGrantId");
TextBox inPotId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inPotId");
TextBox inBudget = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inBudget");
string GrantId, PotId, Budget;
GrantId = inGrantId.Text;
PotId = inPotId.Text;
Budget = inBudget.Text;
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("GrantId", GrantId);
cmd.Parameters.AddWithValue("PotId", PotId);
cmd.Parameters.AddWithValue("Budget", Budget);
}
}
Related
I've coded a gridview that doesn't fire when I click the edit button and I found an older question that addresses my issue by just using e.CommandName with if statements under the RowCommand method. I'm trying to figure out how to implement it with my code.
My question is, how do I use e.RowIndex during update to find my controls and reference those now? Also, I've tried calling my old Update method but it won't let me use sender and e as parameters because GridviewCommandEventArgs is different from GridViewEventUpdateArgs. I'm pretty lost, any help would be appreciated in straightening this out.
C#:
void RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple buttons are used in a GridView control, use the
// CommandName property to determine which button was clicked.
if (e.CommandName == "Edit")
{
}
if (e.CommandName == "Update")
{
UpdateCustomer(sender, e);
string nFirstName = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtFirstName")).Text;
string nLastName = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtLastName")).Text;
string nEmergency = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtEmergency")).Text;
string nCell = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtCell")).Text;
string nAge = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtAge")).Text;
string nActivityCard = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtActivityCard")).Text;
string nBoat = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtBoat")).Text;
string nInitials = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtInitials")).Text;
string nGroup = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtGroup")).Text;
SqlConnection con = new SqlConnection(strConnString);
SqlCommand cmd = new SqlCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "update Person set FirstName=#FirstName, LastName=#LastName, " +
"Emergency#=#Emergency, Cell#=#Cell, Age=#Age, ActivityCard=#ActivityCard, Initials=#Initials, CraftType=#Boat, Group#=#Group " +
"where Person.PersonID=#Pid;" +
"SELECT Person.PersonID, Person.FirstName AS FirstName, Person.LastName AS LastName, Person.Emergency# AS Emergency#, Person.Cell# AS Cell#, Person.Age AS Age, " +
"Person.ActivityCard AS ActivityCard, Person.CraftType AS CraftType, Person.Initials AS Initials, Person.Group# AS Group# " +
"FROM Person INNER JOIN " +
"TripSchedule ON Person.PersonID = TripSchedule.PersonID where TripSchedule.Date = #Date and " +
"TripSchedule.Time = #Time and TripSchedule.TripType = #Type order by Person.Group#;";
cmd.Parameters.Add("#FirstName", SqlDbType.VarChar).Value = nFirstName;
cmd.Parameters.Add("#LastName", SqlDbType.VarChar).Value = nLastName;
cmd.Parameters.Add("#Emergency", SqlDbType.NChar).Value = nEmergency;
cmd.Parameters.Add("#Cell", SqlDbType.NChar).Value = nCell;
cmd.Parameters.Add("#Age", SqlDbType.NChar).Value = nAge;
cmd.Parameters.Add("#ActivityCard", SqlDbType.NChar).Value = nActivityCard;
cmd.Parameters.Add("#Initials", SqlDbType.NChar).Value = nInitials;
cmd.Parameters.Add("#Boat", SqlDbType.VarChar).Value = nBoat;
cmd.Parameters.Add("#Group", SqlDbType.VarChar).Value = nGroup;
cmd.Parameters.AddWithValue("#Date", TextBox1.Text);
cmd.Parameters.AddWithValue("#Time", ddlTripTime.SelectedItem.ToString());
cmd.Parameters.AddWithValue("#Type", ddlTripType.SelectedItem.ToString());
long personID = long.Parse(GridView1.DataKeys[e.RowIndex].Values["PersonID"].ToString());
cmd.Parameters.AddWithValue("#Pid", personID);
GridView1.EditIndex = -1;
GridView1.DataSource = GetData(cmd);
GridView1.DataBind();
}
if (e.CommandName == "Cancel")
{
}
}
ASP.NET:
<div id="dvGrid" style="padding: 0px">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" DataKeyNames="PersonID" runat="server" AutoGenerateColumns="False"
Font-Names="Arial" Font-Size="10pt" AlternatingRowStyle-BackColor="blue" HeaderStyle-BackColor="aqua"
ShowFooter="true" OnRowEditing="EditCustomer" OnRowUpdating="UpdateCustomer"
OnRowCancelingEdit="CancelEdit" ShowHeaderWhenEmpty="true" Height="95px">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label ID="lblFirstName" runat="server" Height="20px" Text='<%# Eval("FirstName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtFirstName" runat="server" Text='<%# Eval("FirstName")%>'></asp:TextBox>
</EditItemTemplate>
<ItemStyle Width = "60px" />
<FooterTemplate>
<asp:TextBox ID="txtFirstName" width="60px" MaxLength="15" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Name">
<ItemTemplate>
<asp:Label ID="lblLastName" runat="server" Text='<%# Eval("LastName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtLastName" runat="server" Text='<%#Bind("LastName")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtLastName" width="60px" MaxLength="15" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Age">
<ItemTemplate>
<asp:Label ID="lblAge" runat="server" Text='<%# Eval("Age")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtAge" runat="server" Text='<%# Eval("Age")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAge" Width="30px" MaxLength="2" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Activity Card">
<ItemTemplate>
<asp:Label ID="lblActivityCard" runat="server" Text='<%# Eval("ActivityCard")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtActivityCard" runat="server" Text='<%# Eval("ActivityCard")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtActivityCard" Width="50px" MaxLength="7" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Cell Phone">
<ItemTemplate>
<asp:Label ID="lblCell" runat="server" Text='<%# Eval("Cell#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtCell" runat="server" Text='<%# Eval("Cell#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtCell" Width="70px" MaxLength="10" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Emergency Phone">
<ItemTemplate>
<asp:Label ID="lblEmergency" runat="server" Text='<%# Eval("Emergency#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEmergency" runat="server" Text='<%# Eval("Emergency#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtEmergency" width="70px" MaxLength="10" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Boat Type">
<ItemTemplate>
<asp:Label ID="lblBoat" runat="server" Text='<%# Eval("CraftType")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtBoat" runat="server" Text='<%# Eval("CraftType")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtBoat" Width="80px" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Initials">
<ItemTemplate>
<asp:Label ID="lblInitials" runat="server" Text='<%# Eval("Initials")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtInitials" runat="server" Text='<%# Eval("Initials")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtInitials" width="30px" MaxLength="2" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Group #">
<ItemTemplate>
<asp:Label ID="lblGroup" runat="server" Text='<%# Eval("Group#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGroup" runat="server" Text='<%# Eval("Group#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtGroup" MaxLength="2" Width="20px" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkRemove" runat="server" CommandArgument='<%# Eval("PersonID")%>'
OnClientClick="return confirm('Are you sure you want to delete?')" Text="Delete"
OnClick="DeleteCustomer"></asp:LinkButton>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="btnAdd" runat="server" Text="Submit" OnClick="AddNewCustomer" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="">
<ItemTemplate>
<asp:LinkButton ID="lnkEdit" runat="server" CommandName="Edit">Edit</asp:LinkButton>
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="lnkUpdate" runat="server" CommandName="Update">Update</asp:LinkButton>
<asp:LinkButton ID="lnkCancel" runat="server" CommandName="Cancel">Cancel</asp:LinkButton>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
You can pass RowIndex as CommandArgument for your LinkButtons.
<EditItemTemplate>
<asp:LinkButton ID="lnkUpdate" runat="server" CommandName="Update" CommandArgument='<%# Container.DataItemIndex %>'>Update</asp:LinkButton>
<asp:LinkButton ID="lnkCancel" runat="server" CommandName="Cancel" CommandArgument='<%# Container.DataItemIndex %>'>Cancel</asp:LinkButton>
</EditItemTemplate>
Which can be access from code behind. Using rowindex you can get hold of the current row and find any controls using FindControl
void RowCommand(Object sender, GridViewCommandEventArgs e)
{
int rowindex = Convert.ToInt32(e.CommandArgument);
if (e.CommandName == "Update")
{
....
}
if (e.CommandName == "Cancel")
{
....
}
}
e.CommandArgument will contain the index of the row clicked, so you can access the relevant controls via
int index = Convert.ToInt32(e.CommandArgument);
GridView1.Rows[index].Controls[x];
I have a gridview that has insert, update, and delete functionality. On my update statement, I'm not sure how to set my identifier PersonID = to the currently selected identifier in the gridview that is being updated. Is there a common method that people use to achieve this functionality?
Code for Asp.net GRIDVIEW
<div id="dvGrid" style="padding: 0px">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"
Font-Names="Arial" Font-Size="10pt" AlternatingRowStyle-BackColor="blue" HeaderStyle-BackColor="aqua"
ShowFooter="true" OnRowEditing="EditCustomer" OnRowUpdating="UpdateCustomer"
OnRowCancelingEdit="CancelEdit" Height="95px">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="First Name">
<ItemTemplate>
<asp:Label ID="lblFirstName" runat="server" Height="20px" Text='<%# Eval("FirstName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtFirstName" runat="server" Text='<%# Eval("FirstName")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtFirstName" width="60px" MaxLength="15" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Name">
<ItemTemplate>
<asp:Label ID="lblLastName" runat="server" Text='<%# Eval("LastName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtLastName" runat="server" Text='<%# Eval("LastName")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtLastName" width="60px" MaxLength="15" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Age">
<ItemTemplate>
<asp:Label ID="lblAge" runat="server" Text='<%# Eval("Age")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtAge" runat="server" Text='<%# Eval("Age")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAge" Width="30px" MaxLength="2" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Activity Card">
<ItemTemplate>
<asp:Label ID="lblActivityCard" runat="server" Text='<%# Eval("ActivityCard")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtActivityCard" runat="server" Text='<%# Eval("ActivityCard")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtActivityCard" Width="50px" MaxLength="7" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Cell Phone">
<ItemTemplate>
<asp:Label ID="lblCell" runat="server" Text='<%# Eval("Cell#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtCell" runat="server" Text='<%# Eval("Cell#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtCell" Width="70px" MaxLength="10" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Emergency Phone">
<ItemTemplate>
<asp:Label ID="lblEmergency" runat="server" Text='<%# Eval("Emergency#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEmergency" runat="server" Text='<%# Eval("Emergency#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtEmergency" width="70px" MaxLength="10" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Boat Type">
<ItemTemplate>
<asp:Label ID="lblBoat" runat="server" Text='<%# Eval("CraftType")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtBoat" runat="server" Text='<%# Eval("CraftType")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtBoat" Width="80px" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Initials">
<ItemTemplate>
<asp:Label ID="lblInitials" runat="server" Text='<%# Eval("Initials")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtInitials" runat="server" Text='<%# Eval("Initials")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtInitials" width="30px" MaxLength="2" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Group #">
<ItemTemplate>
<asp:Label ID="lblGroup" runat="server" Text='<%# Eval("Group#")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGroup" runat="server" Text='<%# Eval("Group#")%>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtGroup" MaxLength="2" Width="20px" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkRemove" runat="server" CommandArgument='<%# Eval("PersonID")%>'
OnClientClick="return confirm('Are you sure you want to delete?')" Text="Delete"
OnClick="DeleteCustomer"></asp:LinkButton>
</itemtemplate>
<FooterTemplate>
<asp:Button ID="btnAdd" runat="server" Text="Submit" OnClick="AddNewCustomer" />
</FooterTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="True" />
</Columns>
<AlternatingRowStyle BackColor="#C2D69B" />
<HeaderStyle BackColor="Aqua" />
</asp:GridView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="GridView1" />
</Triggers>
</asp:UpdatePanel>
</div>
Method for Update:
protected void UpdateCustomer(object sender, GridViewUpdateEventArgs e)
{
string nFirstName = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtFirstName")).Text;
string nLastName = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtLastName")).Text;
string nEmergency = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtEmergency")).Text;
string nCell = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtCell")).Text;
string nAge = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtAge")).Text;
string nActivityCard = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtActivityCard")).Text;
string nBoat = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtBoat")).Text;
string nInitials = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtInitials")).Text;
string nGroup = ((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtGroup")).Text;
SqlConnection con = new SqlConnection(strConnString);
SqlCommand cmd = new SqlCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "update Person set FirstName=#FirstName, LastName=#LastName, " +
"Emergency#=#Emergency, Cell#=#Cell, Age=#Age, ActivityCard=#ActivityCard, Initials=#Initials, CraftType=#Boat, Group#=#Group " +
"where Person.PersonID=Person.PersonID;" +
"SELECT Person.PersonID, Person.FirstName AS FirstName, Person.LastName AS LastName, Person.Emergency# AS Emergency#, Person.Cell# AS Cell#, Person.Age AS Age, " +
"Person.ActivityCard AS ActivityCard, Person.CraftType AS CraftType, Person.Initials AS Initials, Person.Group# AS Group# " +
"FROM Person INNER JOIN " +
"TripSchedule ON Person.PersonID = TripSchedule.PersonID where TripSchedule.Date = #Date and " +
"TripSchedule.Time = #Time and TripSchedule.TripType = #Type order by Person.Group#;";
cmd.Parameters.Add("#FirstName", SqlDbType.VarChar).Value = nFirstName;
cmd.Parameters.Add("#LastName", SqlDbType.VarChar).Value = nLastName;
cmd.Parameters.Add("#Emergency", SqlDbType.NChar).Value = nEmergency;
cmd.Parameters.Add("#Cell", SqlDbType.NChar).Value = nCell;
cmd.Parameters.Add("#Age", SqlDbType.NChar).Value = nAge;
cmd.Parameters.Add("#ActivityCard", SqlDbType.NChar).Value = nActivityCard;
cmd.Parameters.Add("#Initials", SqlDbType.NChar).Value = nInitials;
cmd.Parameters.Add("#Boat", SqlDbType.VarChar).Value = nBoat;
cmd.Parameters.Add("#Group", SqlDbType.VarChar).Value = nGroup;
cmd.Parameters.AddWithValue("#Date", TextBox1.Text);
cmd.Parameters.AddWithValue("#Time", ddlTripTime.SelectedItem.ToString());
cmd.Parameters.AddWithValue("#Type", ddlTripType.SelectedItem.ToString());
GridView1.EditIndex = -1;
GridView1.DataSource = GetData(cmd);
GridView1.DataBind();
}
First specify DataKeyNames="PersonID" for your gridview definition.
Here is how you get the PersonID value in your UpdateCustomer function in code behind.
protected void UpdateCustomer(object sender, GridViewUpdateEventArgs e)
{
// assuming that the value of your PersonID is numeric value
long personID = long.Parse(GridView1.DataKeys[e.RowIndex].Values["PersonID"].ToString());
....
}
The personID value you can pass as an argument to your WHERE clause.
Alternatively you can declare a HiddenField in your gridview and bind PersonID which you can access in you UpdateCustomer function using FindControl method.
I have a gridview written in asp.net (c#), the problem is when try to read data from the textbox return null.
<asp:GridView ID="GridView1" runat="server" DataKeyNames="Week#/Day"
OnRowDataBound="GridView1_RowDataBound"
onrowediting="GridView1_RowEditing"
OnRowUpdating="GridView1_RowUpdating" AutoGenerateColumns="false"
OnPageIndexChanging="GridView1_PageIndexChanging"
OnRowCancelingEdit="GridView1_RowCancelingEdit" AllowPaging="true"
PageSize="4" >
<Columns>
<asp:ButtonField ButtonType="Link" CommandName="Update" text="Update" />
<asp:ButtonField ButtonType="Link" CommandName="Edit" text="Edit"/
<asp:TemplateField HeaderText="Week#/Day" InsertVisible="False"
SortExpression="Week#/Day">
<EditItemTemplate>
<asp:Label ID="Label5" runat="server" Text='<%#
Eval("Week#/Day") %>'></asp:Label>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Saturday" SortExpression="Saturday">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"
Text='<%# Bind("Saturday") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label7" runat="server"
Text='<%# Bind("Saturday") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Sunday" SortExpression="Sunday">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server"
Text='<%# Bind("Sunday") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label8" runat="server"
Text='<%# Bind("Sunday") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Monday" SortExpression="Monday">
<EditItemTemplate>
<asp:TextBox ID="TextBox3" runat="server"
Text='<%# Bind("Monday") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label9" runat="server"
Text='<%# Bind("Monday") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Tuesday" SortExpression="Tuesday">
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server"
Text='<%# Bind("Tuesday") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label10" runat="server"
Text='<%# Bind("Tuesday") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Wednesday"
SortExpression="Wednesday">
<EditItemTemplate>
<asp:TextBox ID="TextBox5" runat="server"
Text='<%# Bind("Wednesday") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label11" runat="server"
Text='<%# Bind("Wednesday") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I am fill it using datatable on edit call this method
protected void GridView1_RowEditing(object sender,GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
BindData();
}
and on update call update method
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
//Retrieve the table from the session object.
DataTable dt = (DataTable)Session["All_Topics"];
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
TextBox d1, d2, d3, d4, d5;
d1 = (TextBox)row.FindControl("TextBox1");
d2 = (TextBox)row.FindControl("TextBox2");
d3 = (TextBox)row.FindControl("TextBox3");
d4 = (TextBox)row.FindControl("TextBox4");
d5 = (TextBox)row.FindControl("TextBox5");
dt.Rows[row.DataItemIndex]["Saturday"] = d1.Text;
dt.Rows[row.DataItemIndex]["Sunday"] = d2.Text;
dt.Rows[row.DataItemIndex]["Monday"] = d3.Text;
dt.Rows[row.DataItemIndex]["Tuesday"] = d4.Text;
dt.Rows[row.DataItemIndex]["Wednesday"] = d5.Text;
}
the problem is when read data from the textbox it is always null. How can I solve this problem.
Hey please Make sure that do not re-binding the GridView on the PostBack of the page. This may be the cause of problem.
Always bind your grid on page load in side the below code.
if (!Page.IsPostBack ){
// Code to bind the Grid
// BindData();
}
when you are click on Row Update Command it is firstly go to the page load event and on page load if you are not binding your grid like the given manner your grid is rebind and you will get null from text box.
Hope it will helps you.
When the user changes the text in the textbox's in the edit template and clicks update, when I try to grab those new values it still is graving the old value of the text box.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
DataKeyNames="CompanyID" CellPadding="4"
GridLines="None" Width="1079px" ForeColor="#333333"
OnRowCancelingEdit="GridView1_RowCancelling"
OnRowUpdating="GridView1_RowUpdating"
OnRowEditing="GridView1_RowEditing">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:TemplateField ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True"
CommandName="Update" CommandArgument='<%# Eval("CompanyID") %>' Text="Update"></asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False"
CommandName="Cancel" Text="Cancel"></asp:LinkButton>
</EditItemTemplate>
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
CommandName="Edit" Text="Edit" ></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Issue Date">
<ItemTemplate>
<asp:Label runat="server" ID="IssueDate" Text='<%#Eval("IssueDate") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtIssueDate" Text='<%#Eval("IssueDate") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Notice Intent Response Due">
<ItemTemplate>
<asp:Label runat="server" ID="NoticeIntentResponseDue" Text='<%#Eval("NoticeIntentResponseDue") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtNoticeIntentResponseDue" Text='<%#Eval("NoticeIntentResponseDue") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Deadline For Questions">
<ItemTemplate>
<asp:Label runat="server" ID="DeadlineForQuestions" Text='<%#Eval("DeadlineForQuestions") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtDeadlineForQuestions" Text='<%#Eval("DeadlineForQuestions") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Bids Due">
<ItemTemplate>
<asp:Label runat="server" ID="BidsDue" Text='<%#Eval("BidsDue") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtBidsDue" Text='<%#Eval("BidsDue") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Shortlist Notice">
<ItemTemplate>
<asp:Label runat="server" ID="ShortlistNotice" Text='<%#Eval("ShortlistNotice") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtShortlistNotice" Text='<%#Eval("ShortlistNotice") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Final Selection">
<ItemTemplate>
<asp:Label runat="server" ID="FinalSelection" Text='<%#Eval("FinalSelection") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtFinalSelection" Text='<%#Eval("FinalSelection") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField Visible="false" HeaderText="CompanyID">
<ItemTemplate>
<asp:Label runat="server" ID="CompanyID" Text='<%#Eval("CompanyID") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
The update button calls this function:
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int key = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value);
Label CompanyID = (Label)GridView1.Rows[e.RowIndex].FindControl("txtCompanyID");
TextBox thisIssueDate = (TextBox)(GridView1.Rows[e.RowIndex].FindControl("txtIssueDate"));
TextBox NoticeIntentResponseDue = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtNoticeIntentResponseDue");
Response.Write(NoticeIntentResponseDue.Text + " " + thisIssueDate.Text);
Response.End();
TextBox DeadlineForQuestions = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtDeadlineForQuestions");
TextBox BidsDue = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtBidsDue");
TextBox ShortlistNotice = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtShortlistNotice");
TextBox FinalSelection = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtFinalSelection");
}
The response is showing me that the value being grabbed is still the origonal text value of the box. Not what you typed into the box.
In your grid view row updating event add the following condition
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
if (e.Row.RowState == DataControlRowState.Edit )
{
int key = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value);
Label CompanyID = (Label)GridView1.Rows[e.RowIndex].FindControl("txtCompanyID");
TextBox thisIssueDate = (TextBox)(GridView1.Rows[e.RowIndex].FindControl("txtIssueDate"));
TextBox NoticeIntentResponseDue = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtNoticeIntentResponseDue");
Response.Write(NoticeIntentResponseDue.Text + " " + thisIssueDate.Text);
Response.End();
TextBox DeadlineForQuestions = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtDeadlineForQuestions");
TextBox BidsDue = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtBidsDue");
TextBox ShortlistNotice = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtShortlistNotice");
TextBox FinalSelection = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtFinalSelection");
}
}
Update:
the problem looks like that you have also bind your Edit Item template columns with the data from data table, and when you are getting the data in the code behind you are not getting the updated data which the user updates in edit mode and u still getting the old data. If you remove the Binding from the Edit Item Template feilds then your code will work.
I figured it out, Derek was right. It had to do with the Binding Data on postback in page load. I binded the data every time instead of just the first time. Thanks
I just attached linq data to gridview it is not showing row ?
DataDataContext db = new DataDataContext();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
BindData();
}
private void BindData()
{
var source = from n in db.Names
select n;
gridSample.DataSource = source.ToList<Name>();
gridSample.DataBind();'
}
<asp:UpdatePanel ID="panelGrid" runat="server">
<ContentTemplate>
<asp:GridView runat="server" ID="gridSample" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField HeaderText="First Name">
<EditItemTemplate>
<asp:TextBox ID="txtFirstName" runat="server" Text='<%Bind("FirstName") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server" ID="lblFirstName" Text='<%Eval("FirstName") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Last Name">
<EditItemTemplate>
<asp:TextBox ID="txtLastName" runat="server" Text='<%Bind("LastName") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server" ID="lblLastName" Text='<%Eval("LastName") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date of Birth">
<EditItemTemplate>
<asp:TextBox ID="txtDOB" runat="server" Text='<%Bind("DOB") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server" ID="lblDOB" Text='<%Eval("DOB") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
Try this
List<Name> source = (from n in db.Names select n).ToList();
gridSample.DataSource = source;
gridSample.DataBind();'
<asp:TextBox ID="txtFirstName" runat="server" Text='<%# Bind("FirstName") %>' />
try this:
private void BindData()
{
var source = from n in db.Names
select n;
gridSample.DataSource = source;
gridSample.DataBind();'
}
Regards
Set the property
AutoPostBack = True
for the GridView. Since it is inside the UpdatePanel.