Unable to get the type of an interface/class using more than one generic type?

Question

Give the example code below, can anyone explain why the first typeof() call works successfully but the second fails?? It doesn't matter if they are classes or interfaces it fails either way.

interface ITestOne<T1>
{
   T1 MyMethod();
}

interface ITestMany<T1, T2>
{
   T1 MyMethod(T2 myParameter);
}

void Main()
{
    var typeOne = typeof(ITestOne<>); //This line works
    var typeTwo = typeof(ITestMany<>); //Compile error
}

Answer 1

You need to let the compiler know that you're looking for the generic type with two generic arguments. Add a comma between the angle brackets:

var typeTwo = typeof(ITestMany<,>);