Code To Bind the data

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Dim dr As SqlDataReader = Nothing

Dim Params(3) As SqlParameterParams(0) = New SqlParameter("@sUserid", SqlDbType.VarChar, 15)

Params(0).Value = userinfo.GetValue(APPR.UserID).ToString

Params(1) = New SqlParameter("@sDate", SqlDbType.VarChar, 10)

Params(1).Value = Me.calDate.SelectedDate.ToShortDateStringParams(2) = New SqlParameter("@sLVL", SqlDbType.VarChar, 1)

Params(2).Value = userinfo.GetValue(APPR.HierarchyLevel)

Params(3) = New SqlParameter("@sQuery", SqlDbType.VarChar, 50)

Params(3).Value = whereqry

Dim errmsg As String = Nothing

If Connect_SQLDataReader(dr, "expt_show", errmsg, Params, CommandType.StoredProcedure) = False Then

ScriptManager.RegisterStartupScript(Me, Me.GetType, "err", "alert('Some unexpected Error Has Occured');", True)

Exit Try

End If

Me.ExptGrid.DataSource = dr

Me.ExptGrid.DataBind()

Me.UpdatePanel4.Update()

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 I have written Some code[setting the header Captions of the columns and filling values in the value lists of some columns] in the initialize layout. The Excecution runs fine before sorting !! After sorting when the same button is clicked.

DataBind is Called.

Which calls initializelayout -> Code written in the intializelayout also works fine [i mean it doesnt throw an exception] , but as soon as the debug pointer comes back to datbind() it throws an exception: 

Object reference not set to an instance of an object.

 

Any ideas ???