Develop Reference

Add New Row in GridView cannot find reference

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);
}
}

how to set compare validatior for footer table text boxes?

I have a grid view with two footer text boxex,
<asp:GridView ID="grdmaster" runat="server" AutoGenerateColumns="false" ShowFooter="true" DataKeyNames="ID">
<Columns>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:TextBox ID="txtdescription" runat="server" > </asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:Label ID="lbltotal" Font-Bold="true" runat="server" Text="Total" > </asp:Label>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Debit">
<ItemTemplate>
<asp:TextBox ID="txtdebit" runat="server" AutoPostBack="true" OnTextChanged="txtdebit_TextChanged"> </asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtdebit1" Font-Bold="true" runat="server" ></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Credit">
<ItemTemplate>
<asp:TextBox ID="txtcredit" runat="server" AutoPostBack="true" OnTextChanged="txtcredit_TextChanged"> </asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtcredit2" Font-Bold="true" runat="server"></asp:Text>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="btndelete" runat="server" class="btn red icn-only" OnClick="btndelete_Click"><i class="icon-remove icon-white"></i> </asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
here I want to compare the footer Textebox txtdebit1 and txtcredit2 values are same or not.How can I set compare validator for.I followed some methods from google but got error message like Compare validator could not find control to validate text box.Is it possible to set compare validator for footer table text box?

Please try below,
protected void grdmaster_ItemDataBound(object sender, GridItemEventArgs e)
{
if (e.Item is GridFooterItem)
{
GridDataItem item = (GridDataItem)e.Item;
TextBox txtdebit1 = item.FindControl("txtdebit1") as TextBox;
TextBox txtcredit2 = item.FindControl("txtcredit2") as TextBox;
TableCell cell = (TableCell)txtdebit1.Parent;
CompareValidator val = new CompareValidator();
val.ControlToCompare = txtcredit2.ID;
val.ControlToValidate = txtdebit1.ID;
val.Operator = ValidationCompareOperator.LessThan;
val.Display = ValidatorDisplay.Dynamic;
val.ErrorMessage = "Error message";
cell.Controls.Add(val);
}
}

Accessing DetailsView fields

I've started creating an online quiz. I am using a DetailsView linked to a sqlDataSource.
Here's my code:
<asp:DetailsView ID="QuestionDetails" runat="server" AutoGenerateRows="False" DataKeyNames="QuestionID,QuizID" DataSourceID="SqlDataSource_Quiz">
<Fields>
<asp:TemplateField HeaderText="Text_Eng" SortExpression="Text_Eng" ShowHeader="False">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Text_Eng") %>'></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Text_Eng") %>'></asp:TextBox>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Text_Eng") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:RadioButton ID="Option1" AccessKey="1" runat="server" Text='<%# Bind("Opt_1") %>' GroupName="AnswerOptions" AutoPostBack="true" OnCheckedChanged="Option_CheckedChanged" />
<br />
<asp:RadioButton ID="Option2" AccessKey="2" runat="server" Text='<%# Bind("Opt_2") %>' GroupName="AnswerOptions" AutoPostBack="true" OnCheckedChanged="Option_CheckedChanged"/>
<br />
<asp:RadioButton ID="Option3" AccessKey="3" runat="server" Text='<%# Bind("Opt_3") %>' GroupName="AnswerOptions" AutoPostBack="true" OnCheckedChanged="Option_CheckedChanged"/>
<br />
</ItemTemplate>
</asp:TemplateField>
</Fields>
</asp:DetailsView>
Note that i am not displaying all data retrieved from the sqlDataSource (there are other fields/columns as well) in the DetailsView.
Now, in my code behind, i am showing the next record by changing the PageIndex of the DetailsView upon clicking a button (NextButton) but at the same time, i need to retrieve some data of the currently displayed record so I've put the following in the button's click handler:
protected void NextButton_Click(object sender, EventArgs e)
{
try
{
// Save off previous answers
DataRowView dr = (DataRowView)QuestionDetails.DataItem;
// Create Answer object to save values
Answer a = new Answer();
a.QuestionID = dr["QuestionID"].ToString();
a.CorrectAnswer = dr["CorrectAnswer"].ToString();
a.UserAnswer = selectedOptionRB.AccessKey.ToString();
ArrayList al = (ArrayList)Session["userAnswers"];
al.Add(a);
Session.Add("userAnswers", al);
}
catch (Exception ex)
{
Label2.Text = "Exception!";
}
if (QuestionDetails.PageIndex == QuestionDetails.PageCount - 1)
{
NextButton.Enabled = false;
}
else
{
QuestionDetails.PageIndex += 1;
NextButton.Enabled = false;
}
if (QuestionDetails.PageIndex == QuestionDetails.PageCount - 1)
{
NextButton.Text = "Finish the Quiz";
}
}
So when i run the code, i get "Exception!" displayed in my Label2 which i setup for testing.
What am i doing wrong?

Gridview not showing records?

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.

Hide asp.net GridView row with condition

This is my grid
<asp:GridView ID="gridProduct" runat="server"
AutoGenerateColumns="false"
ShowFooter="true"
onrowcancelingedit="gridProduct_RowCancelingEdit"
onrowdeleting="gridProduct_RowDeleting" onrowediting="gridProduct_RowEditing"
onrowupdating="gridProduct_RowUpdating"
onrowcommand="gridProduct_RowCommand"
onrowdatabound="gridProduct_RowDataBound">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:Button ID="buttonUpdate" CommandName="Update" runat="server" ToolTip="Update" Text="Update" />
<asp:Button ID="buttonCancel" CommandName="Cancel" runat="server" ToolTip="Cancel" Text="Cancel" />
</EditItemTemplate>
<ItemTemplate>
<asp:Button ID="buttonEdit" CommandName="Edit" runat="server" Text="Edit" ToolTip="Edit"/>
<asp:Button ID="buttonDelete" CommandName="Delete" runat="server" Text="Delete" ToolTip="Delete"/>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="buttonAdd" runat="server" Text="Ajouter" CommandName="AddNew" ToolTip="Add new User" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="#Piece">
<EditItemTemplate>
<asp:Label ID="labelEditPiece" runat="server" Text='<%#Eval("Piece") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="labelItemPiece" runat="server" Text='<%#Eval("Piece") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="dropDownListPartsFooter" runat="server" DataTextField="Nom" DataValueField="ID_AchatTemplate">
</asp:DropDownList>
ControlToValidate="txtBoxPiece" Text="*" ValidationGroup="validaiton"/>--%>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Series">
<EditItemTemplate>
<asp:Label ID="labelEditSeries" runat="server" Text='<%#Eval("Series") %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="labelItemSeries" runat="server" Text='<%#Eval("Series") %>'/>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtBoxSeries" runat="server"/>
<asp:RequiredFieldValidator ID="fieldValidSeries" runat="server" ControlToValidate="txtBoxSeries" Text="*" ValidationGroup="validaiton"/>
</FooterTemplate>
.... </asp:TemplateField>
</Columns>
This is my page load
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
PsaDataSet psaList = new PsaDataSet();
ViewState.Remove("psaList");
ViewState.Add("psaList", psaList);
ViewState.Add("psaUid", Guid.NewGuid());
if (psaList.PsaLink.DefaultView.Count == 0)
{
// Patch for view footer row when no data
PsaDataSet.PsaLinkDataTable tmpList = new PsaDataSet.PsaLinkDataTable();
PsaDataSet.PsaLinkRow tmpItem = tmpList.NewPsaLinkRow();
tmpItem.PsaUid = (Guid)ViewState["psaUid"];
tmpItem.PsaProductUid = Guid.Empty;
tmpItem.ProductId = 1;
tmpItem.Series = "test";
tmpItem.Rev = "test";
tmpItem.Firmware = "test";
tmpList.AddPsaLinkRow(tmpItem);
tmpList.AcceptChanges();
ViewState.Add("series", tmpItem.Series);
gridProduct.DataSource = tmpList;
gridProduct.DataBind();
}
}
else
{
//BindGrid((PsaDataSet)ViewState["psaList"], false);
}
}
private void BindGrid(PsaDataSet psaList, bool mustDataBind)
{
gridProduct.DataSource = psaList.PsaLink;
//if (mustDataBind)
//{
gridProduct.DataBind();
//}
}
This my onrowdatabound="gridProduct_RowDataBound"> method
protected void gridProduct_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes["style"] = "display:none";
}
}
}
I want to add a condition (Based whit a test value inserted in page load) in the if(protected void gridProduct_RowDataBound method) for hiding just one time on page load??
Thank Frank!

I belive you can get the DataBoundItem from the row which is a type of "PsaDataSet.PsaLinkRow" and use that you get the ProductId, Series, etc. and do the condition that you require. Also, you have and if condition inside an if condition with the same condition for both. You only need one.