You catch an unhandled exception in a Page_Error handler in ASP.NET. How can you access the last error?

In ASP.NET, to access the last unhandled exception caught in the Page_Error event handler, you can use the Server.GetLastError() method. The Server.GetLastError() method retrieves the exception object that caused the error.

Here's an example of how you can access the last error in the Page_Error event handler:

protected void Page_Error(object sender, EventArgs e)
{
    Exception lastError = Server.GetLastError();

    // Access and handle the last error
    // For example, log the error or display a custom error message
    // ...

    // Clear the error to prevent it from being handled further
    Server.ClearError();
}

In the Page_Error event handler, the Server.GetLastError() method retrieves the exception object that caused the error. You can then use this exception object to access properties like Message, StackTrace, or InnerException to analyze and handle the error as needed.

It's important to note that after retrieving the last error using Server.GetLastError(), it's common practice to call Server.ClearError() to prevent the error from being handled further by the default error handling mechanism in ASP.NET. By clearing the error, you take full control over handling and displaying the error to the user.

By accessing the last error using Server.GetLastError(), you can implement custom error handling logic, such as logging the error, displaying a user-friendly error message, or redirecting the user to a specific error page based on the exception details.