Allow you to use caller member name attribute in .NET 4. Requires the C#5 compiler so all developers must be using VS2012 else it will fail silently.

gistfile1.cs

 // ReSharper disable CheckNamespace
namespace System.Runtime.CompilerServices
// ReSharper restore CheckNamespace
{
    [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
    public sealed class CallerMemberNameAttribute : Attribute
    {
    }
}