Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
OnError Method

TemplateControl.OnError Method

Raises the Error event.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

protected virtual void OnError(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

An EventArgs that contains the event data.

The following code example demonstrates a possible way to use of the OnError method. It creates a string with some arguments that are not valid, which leads to an exception. Because the TemplateControl class is an abstract class, this code example was written using the Page class, which is derived from the TemplateControl class.

<%@ Page language="c#" %>
 <html>
  <head>
  <script language="C#" runat="server">
  void Page_Load(object sender, System.EventArgs e)
  {
  Page.Error += new System.EventHandler(Error_Handler);
  try
  {
  string myString = "Hello";
  // An exception is raised because the length of 'myString' is less than '6'.
  string mySubString = myString.Substring(0,6);
  }
  catch(Exception)
  {
  OnError(EventArgs.Empty);
  }
  }
  void Error_Handler(object sender,System.EventArgs e)
  {
  Response.Write("<br><b>An Error was raised</b>");
  }
  </script>
  </head>
 </html>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
Show:
© 2015 Microsoft