I want to to delete record(s) from table through C# gridview. The problem is that the rows are only getting deleted from gridview and not from table. I want to remove them from DB as well. here is my code.
private void Delete_Click(object sender, EventArgs e)
{
if (this.dataGridView1.SelectedRows.Count > 0)
{
string a = (string )this.dataGridView1.CurrentCell.Value;
dataGridView1.Rows.RemoveAt(this.dataGridView1.SelectedRows[0].Index);
DeleteRecord(a);
}
Now I want the definition of function DeleteRecord(a) its a humble request to give the code for this function which will obviously have the sql query so that i may delete the rows from table by getting the id of selected row.
It is rather impossible to tell the exact answer.
Multiple ways:Let me show one.
1)Aspx page
<asp:GridView DataKeyNames="CategoryID" ID="GridView1"
runat="server" AutoGenerateColumns="False"
OnRowCommand="GridView1_RowCommand"
OnRowDataBound="GridView1_RowDataBound"
OnRowDeleted="GridView1_RowDeleted" OnRowDeleting="GridView1_RowDeleting">
<Columns>
<asp:BoundField DataField="CategoryID" HeaderText="CategoryID" />
<asp:BoundField DataField="CategoryName" HeaderText="CategoryName" />
<asp:TemplateField HeaderText="Select">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1"
CommandArgument='<%# Eval("CategoryID") %>'
CommandName="Delete" runat="server">
Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
2)Add rowdatabound event.
protected void GridView1_RowDataBound(object sender,
GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton l = (LinkButton)e.Row.FindControl("LinkButton1");
l.Attributes.Add("onclick", "javascript:return " +
"confirm('Are you sure you want to delete this record " +
DataBinder.Eval(e.Row.DataItem, "CategoryID") + "')");
}
}
3)And finally RowCommand:
protected void GridView1_RowCommand(object sender,
GridViewCommandEventArgs e)
{
if (e.CommandName == "Delete")
{
// get the categoryID of the clicked row
int categoryID = Convert.ToInt32(e.CommandArgument);
// Delete the record
DeleteRecordByID(categoryID);
// Implement this on your own :)
}
}
Related
Each row of the GridView is populated from a SQL DB.
Each row has a LinkButton that brings up a popup.
In the code behind I want to have access to the DataField="RCID"
I guess I'd like to attach the RCID field to the Upload link so when it's clicked I have access to the RCID within the function that handles the onclick.
How do I get this rows RCID?
<asp:GridView ID="GridView1" runat="server"
OnPageIndexChanging="GridView1_PageIndexChanging"
GridLines="Horizontal" AllowPaging="true" OnRowCommand="GridView1_RowCommand" AutoGenerateColumns="false">
<Columns>
<asp:BoundField HeaderText="RCID" DataField="RCID" Visible="false"></asp:BoundField>
<asp:BoundField HeaderText="RC Type" DataField="RCType"></asp:BoundField>
<asp:BoundField HeaderText="Channel" DataField="Channel"></asp:BoundField>
<asp:BoundField HeaderText="Total" DataField="Total"></asp:BoundField>
<asp:BoundField HeaderText="Expired In 30 Days" DataField="ExpiredIn30Days"></asp:BoundField>
<asp:BoundField HeaderText="Expired In 60 Days" DataField="ExpiredIn60Days"></asp:BoundField>
<asp:BoundField HeaderText="Expired In 90 Days" DataField="ExpiredIn90Days"></asp:BoundField>
<asp:BoundField HeaderText="Last Updated" DataField="LastUpdated"></asp:BoundField>
<asp:TemplateField HeaderText="Management">
<ItemTemplate>
<asp:LinkButton runat="server" ID="Upload" Text="Upload" CommandName="Upload" ></asp:LinkButton> |
<asp:LinkButton runat="server" ID="Details" Text="Details" CommandName="Details"></asp:LinkButton> |
<asp:LinkButton runat="server" ID="Files" Text="Files" CommandName="Files"></asp:LinkButton> |
<asp:LinkButton runat="server" ID="Edit" Text="Edit" CommandName="Edit"></asp:LinkButton> |
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Possible solution would be as follows:
Add RowCreated and RowCommand events for GridView
In RowCreated event, I have set “Visible” property to “false” for first column for both header and data row.
In RowCommand event, CommandName is checked first and then index for select command is retrieved. I have retrieved the row for that index and then retrieved the text in the specified row cell.
check this example:
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
e.Row.Cells[0].Visible = false;
}
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[0].Visible = false;
}
}
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Select")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = GridView1.Rows[index];
Label1.Text = (row.Cells[0].Text);
}
}
Second approach:
Assign command argument to your hidden field value. This will reduce another efforts. check this way:
<asp:TemplateField HeaderText="Action3" Visible="false">
<ItemStyle HorizontalAlign="Center"></ItemStyle>
<ItemTemplate>
<asp:LinkButton ID="lnkretqty" runat="server" Text="Return Qty" CommandName="RETQTY" ToolTip="Click here to Add Return Qty Entry"
CommandArgument='<%# Container.DataItemIndex %>'>
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
Code Behind code
protected void gvsearch_RowCommand(object sender, GridViewCommandEventArgs e)
{
try
{
if (e.CommandName == "SRCSELREC")
{
Int32 rowind = Convert.ToInt32(e.CommandArgument.ToString());
string val = ((Label)gvgpitemdtl.Rows[rowind].FindControl("d")).Text.ToString();
}
}
catch (Exception ex)
{
General.MessageBox(this.Page, "Error at Gridview Row Command : " + ex.Message.ToString());
return;
}
}
References:
Way of getting Hidden column value in GridView
How to Get Hidden Column values in GridView
To Find Control in GridView on RowCommand event in asp.net
How to hide GridView column and retrieve value from hidden column cell in ASP.NET
Add CommandArgument='<%# Eval("RCID") %>' in the linkbutton's markup:
<asp:LinkButton runat="server" ID="Upload" Text="Upload" CommandName="Upload" CommandArgument='<%# Eval("RCID") %>'/>
Now, in the code behind of the handler, just read the CommandArgumentproperty of the passed GridViewCommandEventArgs parameter:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Upload")
{
var valueOfRCID = e.CommandArgument;
}
}
mshsayem may be right but note you can also just grab the value from within the click event as follows
<asp:LinkButton runat="server" ID="Upload" Text="Upload" OnClick="Upload_Click" CommandArgument='<%# Eval("RCID") %>'/>
protected void Upload_Click(object sender, EventArgs e)
{
LinkButton btn = (LinkButton)(sender);
string RCID = btn.CommandArgument;
}
I have a link button inside a gridView as below :
<asp:TemplateField HeaderText="Analyze">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" Text="Analyze" runat="server" OnClick="LinkButton1_Click" />
</ItemTemplate>
</asp:TemplateField>
I have the LinkButton1_Click function as below :
protected void LinkButton1_Click(object sender, EventArgs e)
{
testtb.Text = name;
Console.WriteLine(name);
}
This variable "name" is the first column of the GridView.I am obtaining the value for "name" as below:
protected void UnanalysedGV_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRowView d = (DataRowView)e.Row.DataItem;
name = d["resultId"].ToString();
}
}
I want that on click of the link button the value of first column in that row of gridview becomes the text for the textbox testtb.
Somehow,the value for name remains null.
EDIT
I found out that probably RowDataBound isn't the correct event for my requirements because I need the value for each row.
So I removed the RowDataBound function.
I guess I have to handle this inside LinkButton1_Click itself.
I added this line to the function :
name = UnanalysedGV.SelectedRow.Cells[1].Text;
Still doesn't work.
Does anyone have any idea ?
You can do it using two approaches as mentioned below.
Handle click event of linkbutton through event bubbling code -
<asp:GridView AutoGenerateColumns="false" runat="server" ID="grdCustomPagging" OnRowCommand="grdCustomPagging_RowCommand">
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="RowNumber" />
<asp:BoundField DataField="DealId" HeaderText="DealID" />
<asp:BoundField DataField="Dealtitle" HeaderText="DealTitle" />
<asp:TemplateField HeaderText="View">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lnkView" CommandArgument='<%#Eval("DealId") %>'
CommandName="VIEW">View Deal</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
protected void grdCustomPagging_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "VIEW")
{
LinkButton lnkView = (LinkButton)e.CommandSource;
string dealId = lnkView.CommandArgument;
}
}
Handle click event of linkbutton directly click event code -
<asp:GridView AutoGenerateColumns="false" runat="server" ID="grdCustomPagging">
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="RowNumber" />
<asp:BoundField DataField="DealId" HeaderText="DealID" />
<asp:BoundField DataField="Dealtitle" HeaderText="DealTitle" />
<asp:TemplateField HeaderText="View">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lnkView" OnClick="lnkView_Click">View Deal</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
protected void lnkView_Click(object sender, EventArgs e)
{
GridViewRow grdrow = (GridViewRow)((LinkButton)sender).NamingContainer;
string rowNumber = grdrow.Cells[0].Text;
string dealId = grdrow.Cells[1].Text;
string dealTitle = grdrow.Cells[2].Text;
}
Hope this helps.
I have a gridview row that when clicked has to do postback A and a buttonfield in that row that when clicked has to do postback B. The problem is that when i click on the buttonfield, both event1 and event2 gets fired. Below is the code.
protected void gdv_RowCommand(object sender, GridViewCommandEventArgs e)
{
string arg = Convert.ToString(((System.Web.UI.WebControls.CommandEventArgs)(e)).CommandArgument);
if (e.CommandName == "Command1")
{
doEvent1(arg);
}
else if (e.CommandName == "Command2")
{
doEvent2(arg);
}
}
protected void gdv_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton b1 = (LinkButton)e.Row.Cells[0].Controls[0];
matchesButton.CommandArgument = arg1;
LinkButton rowLink = (LinkButton)e.Row.Cells[1].Controls[1];
rowLink.CommandArgument = arg2;
e.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(rowLink, "");
}
}
And this is the asp code for the gridview
<Columns>
<asp:ButtonField DataTextField="f1" HeaderText="H1" CommandName="Command1" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="btn1" runat="server" Text="" CommandName="Command2" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
try to use this
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Command2")
{
// Your Code here
}
}
to find control in grid view use this code
LinkButton lnkbtn= (LinkButton)e.Row.FindControl("btn1");
Try adding both the button with in same <asp:TemplateField> if you don't want separate headers
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="button" runat="server" CommandName="Command1" />
<asp:LinkButton ID="btn1" runat="server" CommandName="Command2" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
if you want separate headers make two separate <asp:TemplateField> and then add buttons in them.
I tried a lot of combinations to be able to get rowIndex in below code, What should be the written to below "THIS IS WHERE I WANT TO PASS ROWINDEX " part.
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataKeyNames="Id,BookName" DataSourceID="SqlDataSource1"
Width="800px" CssClass="Gridview">
<Columns>
<asp:TemplateField HeaderText="BookName" SortExpression="BookName" ItemStyle-Width="250px">
<ItemTemplate>
<asp:HyperLink ID="hlk_Bookname" runat="server" Enabled='<%# !Convert.ToBoolean(Eval("Reserve")) %>'
Text='<%# Bind("BookName") %>' NavigateUrl='javascript:doYouWantTo("THIS IS WHERE I WANT TO PASS ROWINDEX ")'></asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
..
..
..
You can use RowDataBound. The property row contains the rowindex
Code behind
protected void GridView1_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType==DataControlRowType.DataRow)
{
((HyperLink)e.Row.FindControl("hlk_Bookname"))
.NavigateUrl=string.Format("javascript:doYouWantTo({0})",e.Row.RowIndex));
}
}
ASPX
<asp:gridview id="GridView1"
onrowdatabound="GridView1_RowDataBound"
......
Edit
If there is a better solution for you problem. I think you are trying to invent the wheel again. I think you can have a look at RowCommand event. You can use it in combination with RowCreated. You can see an example here. Or you can do it something like this:
Code behind
protected void GridView1_RowCommand(Object sender, GridViewCommandEventArgs e)
{
if(e.CommandName=="Add")
{
int index = Convert.ToInt32(e.CommandArgument);
GridViewRow row = ContactsGridView.Rows[index];
//What ever code you want to do....
}
}
//Set the command argument to the row index
protected void GridView1_RowCreated(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton addButton = (LinkButton)e.Row.Cells[0].Controls[0];
addButton.CommandArgument = e.Row.RowIndex.ToString();
}
}
ASPX
<asp:gridview id="GridView1"
onrowcommand="GridView1_RowCommand"
OnRowCreated="GridView1_RowCreated"
runat="server">
<columns>
<asp:buttonfield buttontype="Link"
commandname="Add"
text="Add"/>
Hope this help..
<asp:GridView ID="gvGrid" runat="server" AutoGenerateColumns="False"
DataSourceID="dsDataSource" AllowPaging="True" PageSize="20" >
<Columns>
<asp:BoundField DataField="Field1" HeaderText="Field1"
SortExpression="Field1" />
<asp:BoundField DataField="Field2" HeaderText="Field2"
SortExpression="Field2" />
<asp:TemplateField HeaderText="TemplateField1">
<ItemTemplate>
<asp:Label id="lblComments" runat="server" Text=" i use a function to compute"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowSelectButton="True" SelectText="Complete" HeaderText ="Status" />
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:Button ID="btnComplete" runat="server" Text="Complete" onclick="btnComplete_Click"/>
<asp:Button ID="btnAddComment" runat="server" Text="Add Comment" onclick="btnAddComment_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
protected void btnComplete_Click(object sender, EventArgs e)
{
String Field1 = gvGrid.SelectedRow.Cells[1].Text; // throws an error at runtime
//I want to be able to access the row data do some computation and then be able to insert it into the database
// Reason why I am trying to use it as a template field instead of a commandfield is because I want to make it not visible when it meets certain condition.
}
Also, it would be great if you could let me know a better way to do it, maybe using the command field and if there is a way to toggle its visibility. I don't mind using LinkButton either.
You can do it like this:
protected void btnComplete_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
GridViewRow gvRow = (GridViewRow)btn.Parent.Parent;
//Alternatively you could use NamingContainer
//GridViewRow gvRow = (GridViewRow)btn.NamingContainer;
Label lblComments = (Label)gvRow.FindControl("lblComments");
// lblComments.Text ...whatever you wanted to do
}
here is how you can access to the gridview row:
protected void btnComplete_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in gvGrid.Rows)
{
Label lblComments = row.FindControl("lblComments") as Label;
....//you can do rest of the templatefiled....
}
}