Restricting a method to a given submit button, Using ActionMethod Selector to server multi submit form, to behave different for each submit button in Asp.net MVC

OnlyIfPostedFromButtonAttribute.cs

public class OnlyIfPostedFromButtonAttribute : ActionMethodSelectorAttribute
{
  public string SubmitButton { get; set; }
  public override Boolean IsValidForRequest(ControllerContext controllerContext,
  MethodInfo methodInfo)
  {
    // Check if this request is coming through the specified submit button
    var o = controllerContext.HttpContext.Request[SubmitButton];
    return o != null;
  }
}