Monthly Archives: October 2013

Invalid Postback or callback argument . Event validation is enabled using in configuration or in a page. For security purposes, this feature verifies that arguments to Postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the Postback or callback data for validation.

1 Reply

I was getting this error when pressing the asp:Button that was inside the asp:UpdatePanel. The code was in a Web User Control

      <asp:TemplateField HeaderText="Fecha Expiración" SortExpression="FechaExp" ItemStyle-HorizontalAlign="Center" >
         <ItemTemplate>
            <asp:Button ID="btnExpComFecha" runat="server" Text="[+]" style="background-color: Transparent"
                BorderStyle="None" ToolTip="Mostrar u ocultar la fecha de expiración del documento"
                CommandName="ExpComFecha" CommandArgument="<%# CType(Container,GridViewRow).RowIndex %>" />
            <asp:UpdatePanel ID="panFecha" runat="server" Visible="False">
               <ContentTemplate>
                  <asp:Calendar ID="calFechaExp" runat="server" FirstDayOfWeek="Monday" CellPadding="1" 
                     SelectedDate='<%# IIf(IsDBNull(Eval("FechaExp")), DateTime.MinValue, Eval("FechaExp")) %>'
                     VisibleDate='<%# IIf(IsDBNull(Eval("FechaExp")), DateTime.Now, Eval("FechaExp")) %>' >
                  </asp:Calendar>
                  <asp:Button ID="btnUpdFecha" runat="server" Text="Actualizar" CommandName="ActualizarFecha"
                     CommandArgument="<%# CType(Container,GridViewRow).RowIndex %>" />
               </ContentTemplate>
            </asp:UpdatePanel>
         </ItemTemplate>
      </asp:TemplateField>

I fixed it with this code, that I based on this http://www.dotnetspider.com/resources/29004-A-control-with-ID-button-could-not-be-found.aspx


    Private Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
      Dim oScriptManager As ScriptManager = ScriptManager.GetCurrent(Me.Page)
      For Each oRow As GridViewRow In Me.grdDocumentosSuplidor.Rows
         Dim oButton As Button = DirectCast(oRow.FindControl("btnUpdFecha"), Button)
         oScriptManager.RegisterPostBackControl(oButton)
      Next
   End Sub

Another option was to use an asp:LinkButton, that doesn’t have that problem…