C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;

public class TTest1 {
	public void Test() {
		Console.WriteLine("TTest1.Test");
	}
}

public class TTest2: TTest1 {
	public void Test() {
		Console.WriteLine("TTest2.Test");
	}
}

public class TTest<T> where T: TTest1, new() {
    T FTest;
    public void TestIt() {
		FTest = new T();
		FTest.Test();
	}
}

public class Program
{
	public static void Main()
	{
		new TTest<TTest2>().TestIt();
	}
}

​x
 
using System;
​
public class TTest1 {
    public void Test() {
        Console.WriteLine("TTest1.Test");
    }
}
​
public class TTest2: TTest1 {
    public void Test() {
        Console.WriteLine("TTest2.Test");
    }
}
​
public class TTest<T> where T: TTest1, new() {
    T FTest;
    public void TestIt() {
        FTest = new T();
        FTest.Test();
    }
}
​
public class Program
{
    public static void Main()
    {
        new TTest<TTest2>().TestIt();
    }
}

Compilation error (line 10, col 21): 'TTest2.Test()' hides inherited member 'TTest1.Test()'. Use the new keyword if hiding was intended.
Compilation error (line 18, col 3): An object reference is required for the non-static field, method, or property 'TTest<T>.FTest'
Compilation error (line 19, col 3): An object reference is required for the non-static field, method, or property 'TTest<T>.FTest'

Last Run:	7:50:27 am
Compile:	0s
Execute:	0.111s
Memory:	0b
CPU:	0s

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