using System;
using System.Reflection;
 
public interface IMyInterface
{
	void DoSomething();
}
 
public class MyClass<T> : IMyInterface
{
	public T Value { get; set; }
	public void DoSomething()
	{
		Console.WriteLine("Did something");
	}
}
 
public class Test
{
	public static void Main()
	{
		var testVar = 123;
		var genType = typeof(MyClass<>).MakeGenericType(testVar.GetType());
		var genInstance = Activator.CreateInstance(genType);
		Console.WriteLine(genInstance.GetType().FullName);
		var myInterfaceInstance = (IMyInterface) genInstance;
		myInterfaceInstance.DoSomething();
		object value = genType.InvokeMember("Value", BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, 
		    null, genInstance, null);
		Console.WriteLine(value);
	}
}

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