stevejay

var exception = Server.GetLastError();

stevejay

<customErrors>
    <error statusCode="500" redirect="~/path-to-your-error-page" />
</customErrors>

stevejay

<customErrors defaultRedirect="~/path-to-your-error-page" />

stevejay

<system.web>
    <customErrors defaultRedirect="" />
    <!-- any other elements -->
</system.web>

stevejay

public static void RegisterRoutes(RouteCollection routes)
{    
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
    
    routes.MapRoute(
        "Default",
        "{controller}/{action}/{id}",
        new {controller="Home", action="Index", id=UrlParameter.Optional});
        
    // More routes here.

stevejay

public class SomeApplicationClass : HttpApplication
{   
    ...
}

stevejay

Response.ClearHeaders();
Response.ClearContent();
Response.StatusCode = (int)HttpStatusCode.InternalServerError;
Response.TrySkipIisCustomErrors = true;

stevejay

<system.webServer>
    ...
    <httpErrors errorMode="Custom" existingResponse="Auto">
        <remove statusCode="403" subStatusCode="14"/>
        <error statusCode="403" subStatusCode="14"
               responseMode="ExecuteURL" path="/path/to/Error/Forbidden"/>
        <remove statusCode="404"/>
        <error statusCode="404" responseMode="ExecuteURL"
               path="/path/to/Error/NotFound"/>
    </httpErrors>

stevejay

<system.web>
    ...
    <customErrors mode="On"/>
</system.web>

stevejay

Response.ClearHeaders();
Response.ClearContent();
Response.StatusCode = (int)HttpStatusCode.InternalServerError;