Get the name of the property from attribute

I am using C# 4.5 and ASP.NET MVC 5. I have the following:

       [Required(ErrorMessage = "Prop1 is required")]
         public string Prop1 { get;set;}

   [Required(ErrorMessage = "Prop2 is required")]
         public string Prop2 { get;set;}

As you see the error message is the property name plus the " is required" string. What I need is instead of typing the property name and the message for every property, use a generic method composer, that will return the name of the decorated property and a string that I add, something like:

    public string GetMessage()
{
// Caller property should be a variable that is retrieved dynamically 
// that holds the name of the property that called the function
  return CallerProperty + " is required";
}

so now I can user:

 [Required(ErrorMessage = GetMessage())]
             public string Prop2 { get;set;}

so in brief: How can I know the property name that is decorated by an attribute.