gistfile1.cs

	public static class Guard
	{
		public static void NotNull(object item,string propName)
		{
			if(item==null)
				throw new ArgumentNullException(propName);
		}
		public static void NotNull(Expression<Func<object>> item)
		{
			if(item.Compile()()==null)
				throw new ArgumentNullException(((MemberExpression) item.Body).Member.Name);
		}
		public static void NotNullOrEmpty(Expression<Func<string>> item)
		{
			if (string.IsNullOrEmpty(item.Compile()()))
				throw new ArgumentNullException(((MemberExpression)item.Body).Member.Name);
		}
		public static void NotNullOrEmpty(string item,string name)
		{
			if (string.IsNullOrEmpty(item))
				throw new ArgumentNullException(name);
		}
	}