e.Row.RowState

I’m building a GridView that contains edit/update capabilities. In edit mode for certain rows I need to turn on a drop down list, and based on that row add/remove Items from the list, other rows I want to show a text input to edit, all based on Foreign Key for that row in the database (which I store in a DataKey to access). I handle the OnRowDataBound with a custom subroutine. This hasn?t been an issue in the past but this time I have multiple controls in the ItemTemplate and need to manipulate at databound time, which is a first.

<EditItemTemplate>
<asp:DropDownList ID=?ddlAnswer? runat=?server? Visible=?False?>
<asp:ListItem Value=?Yes? Text=?Yes? />
<asp:ListItem Value=?No? Text=?No? />
<asp:ListItem Value=?Neutral? Text=?Neutral? />
</asp:DropDownList>
<asp:TextBox ID=?txtAnswer? runat=?server? Text=?<%# Bind(?Answer?) %>? Visible=?False?></asp:TextBox>
</EditItemTemplate>

Both have visible=false so I need to get at the bound event and flip one on and change the item list if it?s the DropDownList.

RowState

I find the e.Row.RowState property and assign an if conditional to DataControlRowState.Edit.

If e.Row.RowState = DataControlRowState.Edit Then
 
?CHANGE UPDATE COMMAND ARGUMENT
CType(e.Row.FindControl(?lbUpdate?), LinkButton).CommandArgument = _
e.Row.RowIndex.ToString()
 
Dim iAnswerTypeID = CInt(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(0))
?TURN ON CORRECT TYPE OF INPUT
Select Case CInt(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(0))
Case 1
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).Visible = True
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).SelectedValue = _
CStr(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(2))
 
Case 2
CType(e.Row.FindControl(?txtAnswer?), TextBox).Visible = True
 
Case 3
 
Case 4
CType(e.Row.FindControl(?txtAnswer?), TextBox).Visible = True
CType(e.Row.FindControl(?txtAnswer?), TextBox).TextMode = TextBoxMode.MultiLine
 
Case 5
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).Visible = True
Dim oldListItem As ListItem = CType(e.Row.FindControl(?ddlAnswer?), DropDownList).Items.FindByValue(?Neutral?)
?REMOVE NEUTRAL
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).Items.Remove(oldListItem)
?ADD NA
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).Items.Add _
(New ListItem(CStr(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(1)), CStr(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(1))))
CType(e.Row.FindControl(?ddlAnswer?), DropDownList).SelectedValue = _
CStr(gvEditSurveyResults.DataKeys(e.Row.RowIndex).Item(2))
End Select
 
End If

This doesn?t work, I never get into the if block for all rows. Setting a debug point I find the state of the row is not always DataControlRowState.Edit, but sometimes Alternate with an enumeration of 5. Looking thru Microsoft documentation I don?t see any 5 reference.

My Assumption

I am assuming that every property of the DataControlRowState handler has an Alternate row of that plus 1. So edit = 4 and edit on an alternative row is 5.