How do I get the type name of a generic type argument?

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Your code should work. typeof(T).FullName is perfectly valid. This is a fully compiling, functioning program:

using System;

class Program 
{
    public static string MyMethod<T>()
    {
        return typeof(T).FullName;
    }

    static void Main(string[] args)
    {
        Console.WriteLine(MyMethod<int>());

        Console.ReadKey();
    }

}

Running the above prints (as expected):

System.Int32

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