Object reference not set to an instance of an object

[Ben]

Hi,

i try to change the display value of a radiobuttonlist embedded in a
gridview, but only in normal mode. In edit mode, the radiobuttonlist must
appears.

With this code below, i get what i want in normal mode (displayed values
(yes/no) are ok), but when i try to edit the row, i get:

"Object reference not set to an instance of an object."
at line: lbl.Text = "yes"

So, what's wrong here?
By the way, i also tried with:
If (e.Row.RowState And DataControlRowState.Normal) =
DataControlRowState.Normal Then
....

and with:
'If (e.Row.RowState And DataControlRowState.Normal) = 0 Then
.....

but same error ..
Thanks
Ben

<asp:TemplateField>
<EditItemTemplate>
<asp:RadioButtonList ID="r1" SelectedValue='<%# Bind("myfield") %>'
runat="server">
</asp:RadioButtonList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Labelvp" runat="server" Text='<%# Bind("myfield")
%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.GridViewRowEventArgs) Handles
GridView1.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim mf As Boolean = DataBinder.Eval(e.Row.DataItem, "myfield")
Dim lbl As Label = e.Row.FindControl("Labelvp")

If myfield = True Then
lbl.Text = "yes"
Else
lbl.Text = "no"
End If
End If
End Sub

 

[Rain]

You need to detect what the item type is because you have ItemTemplate,
AlternateItem, Footer, Header etc. You have put this in the ItemTemplate,
but there are other Template
types. I cant remember the exact sytax for the event args, but its
something like.


if( e.TemplateType == TemplateItem.ItemTemplate ) // Do Somtehng

 

[Ben]

Thanks for replying. but

In the sub GridView1_RowDataBound, i only can find: e.Row.TemplateControl =
....

I couldn't find e.TemplateType nor TemplateItem.ItemTemplate in the
intellisense.

 

[Rain]

Sorry, wrong operation.

You may want to try something like.

e.Row.Cells[0].FindControl('id');

 

[Ben]

But i did that: i tried with:

Dim lbl As Label = e.Row.FindControl("Labelvp")

and with this:

Dim lbl As Label = e.Row.Cells(5).FindControl("Labelvp")

but both gives the same error ...

Sorry, wrong operation.

You may want to try something like.

e.Row.Cells[0].FindControl('id');

Thanks for replying. but

In the sub GridView1_RowDataBound, i only can find:
e.Row.TemplateControl = ...

I couldn't find e.TemplateType nor TemplateItem.ItemTemplate in the
intellisense.