Should I Throw ArgumentNullException if a string is blank?

Question

I working on a method that does something given a string parameter. A valid value for the string parameter is anything other than null or string.Empty. So my code looks li

Answer 1

Why don't use this code?

private void SomeMethod(string someArgument)
{
//chek only NULL
if(ReferenceEquals(someArgument,null))
    throw new ArgumentNullException("someArgument");

// and after trim and check
if (someArgument.Trim() == String.Empty)
    throw new ArgumentException("Input cannot be empty", "someArgument");

// do some work
}