CODEWITHSUNDEEP
asp.net
Internet Engineer
Internet Engineer

Reputation: 2534

Hide Existing Panel Server Side

I am trying to hide a panel based on values, using server side code.

Web form Code

Server Side Code does execute

Public Sub CustomerDataSource_Selected(ByVal source As Object, ByVal e As ObjectDataSourceStatusEventArgs)
    Dim DisplayPanel As Boolean
    DisplayPanel = False
    If e.ReturnValue IsNot Nothing Then
        If e.ReturnValue(0).x1 < e.ReturnValue(0).x2 Then
            DisplayPanel = True
        End If
    End If

    Dim FPanel As Panel = CType(FormView.FindControl("FuturePanel"), Panel)
    FPanel.Visible = DisplayPanel 'here is the problem...
End Sub

I get the exception below because the sub "CustomerDataSource_Selected" is invoked by the ObjectDataSource, which has no access to the form's Control Collections in the code above :

Object reference not set to an instance of an object.

How can I hide the panel using the current sub, which needs access to the control collection?

Remember that the sub is invoked from the ObjectDataSource?

Is this possible?

Upvotes: 0

Views: 39

Answers (1)

Jason Geiger
Jason Geiger

Reputation: 2112

Looks like 

Dim FPanel As Panel = CType(FormView.FindControl("FuturePanel"), Panel)

Is not getting the control. (FPanel == Null)

Try this...

Dim FPanel As Panel = CType(FormView1.Row.Cells[0].FindControl("FuturePanel"), Panel)

Upvotes: 1

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