create interface with method that return generic object and where clausule

public interface IGeneric<T>
{
    T Get();
}

public class GenericClass<T> : IGeneric<T>
{
    public T Get()
    {
        throw new NotImplementedException();
    }
}

public static class Run
{
    public static void Main()
    {
        var igen = new GenericClass<int>();
        var sgen = new GenericClass<string>();

        DoSomething(igen);
        DoSomething(sgen);
    }

    private static void DoSomething<T>(IGeneric<T> arg) where T : class
    {
        Console.WriteLine(arg.Get());
    }
}