Checkbox not working

[jmcilhinney]

This is silly code:

                    Select Case True
                        Case Det01 = "True"
                            ccb01DetOverride.Checked = True
                        Case Else
                            ccb01DetOverride.Checked = False
                    End Select

That's not what a Select Case is for. That would properly be written as:

If Det01 = "True" Then
    ccb01DetOverride.Checked = True
Else
    ccb01DetOverride.Checked = False
End If

or, even more simply:

ccb01DetOverride.Checked = (Det01 = "True")

You can easily set a breakpoint on the appropriate line and check the value of Det01 right as it's being used. A possible reason that it may not work as expected is that there is actually a space at the end of the text. Of course, if you want to store Boolean values in SQL Server then you should be using the bit data type rather than nvarchar if at all possible, but there may be a valid reason that that is not possible.