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DataGrid TextBox Question

Posted on 2004-09-27
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Last Modified: 2010-04-23
Hi,

I have a datagrid on my form.  I also have the update/edit/cancel commands.  I want to simply allow a user to click the edit button, then when the textboxes are displayed they can input information and click update.  Here is my code...

Dim txt As String

txt = Convert.ToString(CType(e.Item.FindControl("DateSent"), TextBox).Text)
txtName.Text = txt

When I click update I get this error...

Object reference not set to an instance of an object.

Help!

Ryan
0
Comment
Question by:NeoTek
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6 Comments
 
LVL 25

Expert Comment

by:RonaldBiemans
ID: 12160248
I think I need a bit more code. When and where do you get the error, the code above in which event is it handled ?
0
 
LVL 1

Author Comment

by:NeoTek
ID: 12160386
Hi,

This is the function the code is in...

Private Sub dgStatus_UpdateCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles dgStatus.UpdateCommand

        Dim txt As String

        txt = Convert.ToString(CType(e.Item.FindControl("DateSent"), TextBox).Text)
        txtName.Text = txt

End Sub

I get the error when the user click on the 'Update' button on the datagrid.

The error is with the line...

txt = Convert.ToString(CType(e.Item.FindControl("DateSent"), TextBox).Text)

NeoTek
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LVL 25

Accepted Solution

by:
RonaldBiemans earned 50 total points
ID: 12160495
And how is this event generated ? Because it seems that
e (System.Web.UI.WebControls.DataGridCommandEventArgs) is nothing
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LVL 1

Author Comment

by:NeoTek
ID: 12161191
Hi,

A user goes to this form.  They click 'edit' on one of the rows in the datagrid.  They edit a text box and click update.  They get the error when they click update.

Ryan
0
 
LVL 1

Author Comment

by:NeoTek
ID: 12161531
I tried to do this...

txtName.Text = dgStatus.Items.Item(e.Item.ItemIndex).Cells(6).Text

That doesn't return the value in the textbox, it just returns blank, but this...

txtName.Text = dgStatus.Items.Item(e.Item.ItemIndex).Cells(4).Text

will return a value, but that field can't be edited...

Ryan
0
 
LVL 1

Author Comment

by:NeoTek
ID: 12168684
Hi,

I believe I solved my problem.  It looks like I was data binding on every page load, therefore the info was reset and the original data was being written to the database.  Thanks for your help.

Ryan
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