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DataItem on bound datagrid is nothing....why?

Posted on 2011-09-13
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Last Modified: 2012-05-12
On a web form, I have a grid bound to a list of business objects.   The grid is not editable but it has two auto-generated buttons, Edit and Select.   After clicking Select, I click Edit on the same row activates the code attached....

 
Private Sub GridViewRegistrants_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridViewRegistrants.RowEditing

        Session("PatientDetails") = GridViewRegistrants.SelectedRow.DataItem



        Response.Redirect("http://localhost:24820/UserDetails.aspx")

    End Sub

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But for some reason, debugging shows the value of DataItem to be nothing, even though SelectedRow is not.    (Yeah, I know I need to fix localhost, I will get to that soon...)

What am I doing wrong?   How do I get a reference to the underlying object?   That is what I expected DataItem to provide.
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Question by:codefinger
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6 Comments
 
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Accepted Solution

by:
Pratima Pharande earned 2000 total points
ID: 36528122
I think you need something like this
mention the number of cell you want to get result Cells.Item(4)

 Dim strString As String

        strString= GridView1.SelectedRow.Cells.Item(4).Text.ToString

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Author Comment

by:codefinger
ID: 36530025

That will work.  

I found out the reason my approach does not is that a web form does not maintain a connection to the list of items  (my last two projects were desktop winforms applications...I am spoiled!)
It uses the ViewState, so DataItem = Nothing is actually true.

My displayed column order is going to be changing around a lot as I work on the display.  Is there any way to reference the values by names instead of numbers?

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LVL 83

Expert Comment

by:CodeCruiser
ID: 36532184
I think you can use column name in place of the column index.
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Author Comment

by:codefinger
ID: 36532289
CodeCruiser:

I thought I remembered that as well, but it does not work:

GridViewRegistrants.SelectedRow.Cells.Item("LastName").Text      {"Conversion from string "LastName" to type 'Integer' is not valid."}      System.InvalidCastException
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LVL 83

Expert Comment

by:CodeCruiser
ID: 36532334
Try

GridViewRegistrants.SelectedRow.Cells("LastName").Text

OR

GridViewRegistrants.Rows(GridViewRegistrants.SelectedIndex).Cells("LastName").Text
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Author Closing Comment

by:codefinger
ID: 36532472
I found out the reason my approach does not work is that a web form does not maintain a connection to the list of items  (my last two projects were desktop winforms applications...I am spoiled!)
It uses the ViewState, so DataItem = Nothing is actually true.

So you have to take your values from the grid as the expert described.
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