Setting Selection in Datagrid Edit

Colonel Angus · January 29th, 2005, 02:00 PM

I have a datagrid cell that renders as a label when loaded, but in edit mode becomes a drop down list. I want to set the selection on the dropdown list.

I am using the OnEditCommand function to try this. Here's my code:

Code:

Sub dgImpact_Edit(ByVal sender As Object, ByVal e As DataGridCommandEventArgs)
    Dim FundingSource As String = CType(e.Item.FindControl("lblFundingSource"), Label).Text

        GetFundingSources()
        dgImpact.EditItemIndex = e.Item.ItemIndex
        BindImpactGrid()

        Dim ddlFundingSource As DropDownList = CType(e.Item.FindControl("ddlFundingSource"), DropDownList)
        ddlFundingSource.SelectedValue = FundingSource
End Sub

This gives me the dreaded "Object reference not set to an instance of an object" error.

What am I missing? Thanks in advance for your comments.

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In God we trust, everything else we test.

mehdi62b · January 30th, 2005, 11:09 AM

do all of them in Update_Command event instead,you need just two lines in Edit_Command,

Code:

dgImpact.EditItemIndex = e.Item.ItemIndex;
BindGrid();

then in Update_Command find your DropDownList and retrieve its properties.

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.

Colonel Angus · January 31st, 2005, 09:38 AM

Mehdi-

Thank you for your input. I decided to go the ItemDatabound event route. I found a solution when I was digging around MSDN here: http://msdn.microsoft.com/library/de...verControl.asp

Look under the section "Displaying a Drop-Down List in Edit Mode"

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In God we trust, everything else we test.

mehdi62b · January 31st, 2005, 11:44 AM

Quote:

quote:Originally posted by Colonel Angus
...I decided to go the ItemDatabound event route.

well,you should have made that decision,for initial population and resetting the properties of the DropDownList,ItemDatabound is used, after that in another event(like Update_Command) you get
the new state of the DropDownList has been made by the user(or everything else).

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.