Custom Error Message MVC - asp.net

Question

Working on Project which is mixture of ASP.Net Web Forms & MVC.
Scenario : In an Web Form application , part of an page is rendering using MVC Partial View as shown below image.
In Web Form aspx page , have defined an Div with ID = MVCPartialView1 and using Jquery Ajax successfully can bind the returned Partial View to Web Form.
$.ajax(
{
success: function (msg) { $("#MVCPartialView1").html(msg); }
});
For Handling Error Scenario made use of the following code.
[AttributeUsage(AttributeTargets.Class)]
public sealed class ErrorAttribute : HandleErrorAttribute
{
public override void OnException(ExceptionContext filterContext)
{
// Execute the normal exception handling routine
base.OnException(filterContext);
if (filterContext.HttpContext.Request.IsAjaxRequest())
{
filterContext.Result = new ViewResult
{
ViewName = "CustomError.aspx"
};
}
}
}
Base Controller :
[ErrorAttribute]
public class BaseController : Controller
Actual Problem is when an any exception occurred inside MVC Partial View ( Controller ) , CustomError is displayed only inside DIV MVCPartialView1 but it would make sense to show CustomError as full Contain of WebForm.aspx
But Expected CustomError Message is :

Answer 1

You can make it work only with js in your scenario.
Some thing like this:
$.ajax(
{
success: function (msg)
{
if(msg.indexOf("Error") > -1) //You should check if Error page returned
{
window.location.href = "CustomError.aspx"; //Here if redirect to error of full page
}
else
{
$("#MVCPartialView1").html(msg);
}
}
});