Handle a Callback Exception on the Server Side

• Dec 27, 2023

Use the static CallbackError event to handle a callback exception thrown by a DevExpress web control on the server side.

Delegate callback exception handling to the Application_Error event handler.

Global.asax.cs

void Application_Start(object sender, EventArgs e) { 
    DevExpress.Web.ASPxWebControl.CallbackError += Application_Error;
} 

Global.asax.vb

Protected Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    DevExpress.Web.ASPxWebControl.CallbackError += AddressOf Application_Error
End Sub

In the Application_Error event handler, you can use the GetLastError() method to get the last exception’s details.

Global.asax.cs

void Application_Error(object sender, EventArgs e) { 
    // Use HttpContext.Current to get a Web request processing helper 
    HttpServerUtility server = HttpContext.Current.Server; 
    Exception exception = server.GetLastError(); 
    // Log an exception 
    AddToLog(exception.Message, exception.StackTrace); 
}

Global.asax.vb

Private Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
    ' Use HttpContext.Current to get a Web request processing helper 
    Dim server As HttpServerUtility = HttpContext.Current.Server
    Dim exception As Exception = server.GetLastError()
    ' Log an exception 
    AddToLog(exception.Message, exception.StackTrace)
End Sub

View Example: How to handle application-level errors occurred during callbacks