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create error when gridview update text field has too many characters.

designaire
designaire asked
on
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Last Modified: 2012-05-06
I have a gridview that has update capabilities. How do I create an error message when there are more that say 20 characters? Thanks in advance
<asp:GridView ID="eventsGrid" runat="server" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="ID"
         DataSourceID="AccessDataSource1" 
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"/>
                <asp:TemplateField HeaderText="Event" SortExpression="event">
                    <EditItemTemplate>
                        <asp:TextBox ID="txtUpdateEvent" runat="server" Text='<%# Bind("event") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <ItemTemplate>                   
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("event") >'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>        
                <asp:CommandField ButtonType="Button" ShowEditButton="True" />
            </Columns>
 
Protected Sub EventsGrid_RowUpdated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdatedEventArgs) Handles eventsGrid.RowUpdated
        If e.Exception IsNot Nothing Then
        lblError.Text = "An exception ocurred." & e.Exception.Message
        e.ExceptionHandled = True
       e.KeepInEditMode = True
         ElseIf e.AffectedRows = 0 Then
          lblError.Text = "No rows Updated"
 End If
End Sub

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Commented:
Yes, thank you. It does throw an exception. Maybe because of the below code. I had to set the maximum inthe database also.

Protected Sub EventsGrid_RowUpdated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdatedEventArgs) Handles eventsGrid.RowUpdated
        If e.Exception IsNot Nothing Then
        lblError.Text = "An exception ocurred." & e.Exception.Message
        e.ExceptionHandled = True
       e.KeepInEditMode = True
         ElseIf e.AffectedRows = 0 Then
          lblError.Text = "No rows Updated"
 End If
End Sub
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