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Control.Validating Event

Occurs when the control is validating.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public event CancelEventHandler Validating
/** @event */
public void add_Validating (CancelEventHandler value)

/** @event */
public void remove_Validating (CancelEventHandler value)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl.ActiveControl property to the current form, focus events occur in the following order:

  1. Enter

  2. GotFocus

  3. Leave

  4. Validating

  5. Validated

  6. LostFocus

When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:

  1. Enter

  2. GotFocus

  3. LostFocus

  4. Leave

  5. Validating

  6. Validated

If the CausesValidation property is set to false, the Validating and Validated events are suppressed.

If the Cancel property of the CancelEventArgs is set to true in the Validating event delegate, all events that would usually occur after the Validating event are suppressed.

For more information about handling events, see Consuming Events.

Windows Mobile 2003 for Pocket PC, Windows Mobile 2003 for Smartphone, Windows CE Platform Note: The Validating event fires after LostFocus in all code sequences on the .NET Compact Framework, except where it is not possible to restore focus later, such as when closing the form.

The following code example uses the derived class TextBox and validates an e-mail address that the user enters. If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an ErrorProvider icon is displayed, and the event is canceled. This example requires that a TextBox and ErrorProvider control have been created on a form.

private void textBox1_Validating(object sender, 
 				System.ComponentModel.CancelEventArgs e)
{
   string errorMsg;
   if(!ValidEmailAddress(textBox1.Text, out errorMsg))
   {
      // Cancel the event and select the text to be corrected by the user.
      e.Cancel = true;
      textBox1.Select(0, textBox1.Text.Length);

      // Set the ErrorProvider error with the text to display. 
      this.errorProvider1.SetError(textBox1, errorMsg);
   }
}

private void textBox1_Validated(object sender, System.EventArgs e)
{
   // If all conditions have been met, clear the ErrorProvider of errors.
   errorProvider1.SetError(textBox1, "");
}
public bool ValidEmailAddress(string emailAddress, out string errorMessage)
{
   // Confirm that the e-mail address string is not empty.
   if(emailAddress.Length == 0)
   {
      errorMessage = "e-mail address is required.";
         return false;
   }

   // Confirm that there is an "@" and a "." in the e-mail address, and in the correct order.
   if(emailAddress.IndexOf("@") > -1)
   {
      if(emailAddress.IndexOf(".", emailAddress.IndexOf("@") ) > emailAddress.IndexOf("@") )
      {
         errorMessage = "";
         return true;
      }
   }
   
   errorMessage = "e-mail address must be valid e-mail address format.\n" +
      "For example 'someone@example.com' ";
      return false;
}

private void textBox1_Validating(Object sender, 
    System.ComponentModel.CancelEventArgs e)
{
    String errorMsg = "";

    if (!(ValidEmailAddress(textBox1.get_Text(), errorMsg))) {
        // Cancel the event and select the text to be corrected by the user.
        e.set_Cancel(true);
        textBox1.Select(0, textBox1.get_Text().get_Length());

        // Set the ErrorProvider error with the text to display. 
        this.errorProvider1.SetError(textBox1, errorMsg);
    }
} //textBox1_Validating

private void textBox1_Validated(Object sender, System.EventArgs e)
{
    // If all conditions have been met, clear the ErrorProvider of errors.
    errorProvider1.SetError(textBox1, "");
} //textBox1_Validated

public boolean ValidEmailAddress(String emailAddress, 
    /** @ref 
     */ String errorMessage)
{
    // Confirm that the e-mail address string is not empty.
    if (emailAddress.get_Length() == 0) {
        errorMessage = "e-mail address is required.";
        return false;
    }

    // Confirm that there is an "@" and a "." in the e-mail address, 
    // and in the correct order.
    if (emailAddress.IndexOf("@") > -1) {
        if (emailAddress.IndexOf(".", 
            emailAddress.IndexOf("@")) > emailAddress.IndexOf("@")) {
            errorMessage = "";
            return true;
        }
    }
    errorMessage = "e-mail address must be valid e-mail address format.\n" 
        + "For example 'someone@example.com' ";
    return false;
} //ValidEmailAddress

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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