/*
How to validate two textboxes to ensure only one textbox contains data. Copy
and paste into Visual Studio for best results reading and comprehending how
this solution may be helpful to learn from...

*/

<%-- CUSTOM VALIDATOR --%>
<asp:CustomValidator
   ID="ManagingEditorValidator" runat="server"
   EnableViewState="false"
   OnServerValidate="ManagingEditorTextBoxes_CustomValidator"
   ErrorMessage="" />

// CustomValidator raises this event...
#region Validation: ManagingEditorTextBoxes_CustomValidator...
       protected void ManagingEditorTextBoxes_CustomValidator(object
source, ServerValidateEventArgs args)
       {
           if (ChannelManagingEditorEmailTextBox.Text.Length > 0 &&
ChannelManagingEditorNameTextBox.Text.Length > 0)
           {
               args.IsValid = false;
               ManagingEditorValidationLabel.Text = "<span
style='color:red;font-weight:bold;'>Only one TextBox may contain
data.</span>";
               ChannelBuilderWizard.ActiveStepIndex = 5; //
Step5_ChannelManagingEditor
           }
           else
           {
               args.IsValid = true;
               ManagingEditorValidationLabel.Text = "-- or --";
           }
       }//protected void ManagingEditorTextBoxes_CustomValidator(object
source, ServerValidateEventArgs args)
#endregion

/*
I also used the OnActiveStepChanged event of a Wizard control to determine
when to call a ValidateManagingEditorOrWebmasterTextBoxes() method
that --also-- modifies the ManagingEditorValidationLabel I have mentioned.
You can figure out where to call the method once you study and learn how
this example of server-side validation works.
*/

#region Validation: ValidateManagingEditorOrWebmasterTextBoxes...
       // Both ManagingEditor and Webmaster steps display a set of
TextBoxes; one for email and another for a name
       // but only one TextBox may be used to submit data.
       // ChannelBuilderWizard_OnActiveStepChanged calls this method when
selecting the Wizard's Next button.
       // ManagingEditorTextBoxes_CustomValidator and
WebmasterTextBoxes_CustomValidator are called when SideBar LinkButtons are
selected.
       protected void ValidateManagingEditorOrWebmasterTextBoxes()
       {
           if (ChannelManagingEditorEmailTextBox.Text.Length > 0 &&
ChannelManagingEditorNameTextBox.Text.Length > 0)
           {
               ManagingEditorValidationLabel.Text = "<span
style='color:red;font-weight:bold;'>Only one TextBox may contain
data.</span>";
               ChannelBuilderWizard.ActiveStepIndex    = 5;
           }
           else if (ChannelWebmasterEmailTextBox.Text.Length > 0 &&
ChannelWebmasterNameTextBox.Text.Length > 0)
           {
               WebmasterValidationLabel.Text = "<span
style='color:red;font-weight:bold;'>Only one TextBox may contain
data.</span>";
               ChannelBuilderWizard.ActiveStepIndex    = 6;
           }
           else
           {
               if
(String.IsNullOrEmpty(ChannelManagingEditorEmailTextBox.Text.ToString()) ||
String.IsNullOrEmpty(ChannelManagingEditorNameTextBox.Text.ToString()))
               {
                   ManagingEditorValidationLabel.Text = "-- or --";
               }
               if
(String.IsNullOrEmpty(ChannelWebmasterEmailTextBox.Text.ToString()) ||
String.IsNullOrEmpty(ChannelWebmasterNameTextBox.Text.ToString()))
               {
                   WebmasterValidationLabel.Text = "-- or --";
               }
           }
       }//ValidateManagingEditorAndWebmasterTextBoxes()
#endregion

<%= Clinton Gallagher