Default Values for DetailsView

[esi]

New to ASP.NET so any help you can offer would be great! I have been
searching the web all day to try and figure out how I can add a
default value to a field on a DetailsView control.

I did find a few examples on the web and I understand what the code is
trying to do, but I cannot get it to work for me.

Here is my code:

<asp:DetailsView ID="DetailsView1" runat="server" AllowPaging="True"
AutoGenerateRows="False"
BackColor="White" BorderColor="#E7E7FF" BorderStyle="None"
BorderWidth="1px"
CellPadding="3" DataKeyNames="DefectID"
DataSourceID="SqlDataSource2" Font-Names="Arial"
Font-Size="8pt" GridLines="Horizontal" Height="50px"
Width="331px" OnPreRender="DetailsView1_PreRender">
<FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
<RowStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" />
<PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C"
HorizontalAlign="Right" />
<Fields>
<asp:BoundField DataField="DefectID"
HeaderText="DefectID" InsertVisible="False"
ReadOnly="True" SortExpression="DefectID" />
<asp:BoundField DataField="InspID" HeaderText="InspID"
SortExpression="InspID" />
<asp:BoundField DataField="DefectCode"
HeaderText="DefectCode" SortExpression="DefectCode" />
<asp:BoundField DataField="TBL" HeaderText="TBL"
SortExpression="TBL" />
<asp:BoundField DataField="SchematicRef"
HeaderText="SchematicRef" SortExpression="SchematicRef" />
<asp:BoundField DataField="DefectQty"
HeaderText="DefectQty" SortExpression="DefectQty" />
<asp:BoundField DataField="TestSymptom"
HeaderText="TestSymptom" SortExpression="TestSymptom" />
<asp:BoundField DataField="SymptomNumber"
HeaderText="SymptomNumber" SortExpression="SymptomNumber" />
<asp:BoundField DataField="Tech" HeaderText="Tech"
SortExpression="Tech" />
<asp:BoundField DataField="SerialNum"
HeaderText="SerialNum" SortExpression="SerialNum" />
<asp:BoundField DataField="RepairBy"
HeaderText="RepairBy" SortExpression="RepairBy" />
<asp:BoundField DataField="RetestedBy"
HeaderText="RetestedBy" SortExpression="RetestedBy" />
<asp:BoundField DataField="RetestDate"
HeaderText="RetestDate" SortExpression="RetestDate" />
<asp:BoundField DataField="PassFail"
HeaderText="PassFail" SortExpression="PassFail" />
<asp:BoundField DataField="RepairComments"
HeaderText="RepairComments" SortExpression="RepairComments" />
<asp:CommandField ShowEditButton="True"
ShowInsertButton="True" />
</Fields>

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- -

Protected Sub DetailsView1_PreRender(ByVal sender As Object, ByVal
e As System.EventArgs)
If DetailsView1.CurrentMode = DetailsViewMode.Insert Then
Dim ThisControl As TextBox
ThisControl = DetailsView1.FindControl("PassFail")
ThisControl.Text = "Pass"
End If
End Sub

*Note - I have tried the code on the following events: PreRender,
DataBinding, and ItemInserting, ensuring that the asp: code is updated
correctly.

Without the default being set for the PassFail field the update works
well.

This is the error message I'm receiving (Line 83):

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not
set to an instance of an object.

Source Error:
Line 81: Dim ThisControl As TextBox
Line 82: ThisControl =
DetailsView1.FindControl("PassFail")
Line 83: ThisControl.Text = "Pass"
Line 84: End If
Line 85: End Sub

Basically what I am trying to do is be able to insert new detail
records. I get the error when I click the "Insert" link at the bottom
of the DetailsView control.

I am using Visual Web Developer 2005 Express Edition, but I do have a
full version of .NET Studio (2005).

Any tips or hints would be appreciated! Thanks in advance!