hello all , I am trying to create url routing with strongly typed objects for pages but I keep getting null object on the first line so it's crashing

//Getting the suitable executing Page
var display = BuildManager.CreateInstanceFromVirtualPath(_virtualPath,typeof(Page)) as IProfileHandler;
//Setting Page Parameters
display.MemberId = Convert.ToInt32(requestContext.RouteData.Values["ID"]);
//Return Page
return display;

public interface IProfileHandler : IHttpHandler
{
    int MemberId
    {
        get;
        set;
    }
}