using System;

public class Type1 {

    public string Prop1 { get; set; }

    public Type2 Prop2 { get; set; }

}

​

public class Type2 {

    public string Prop { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        Type1 testObj = new Type1 { 

            Prop1 = "TEST",

            Prop2 = { Prop = "TEST2" }

        };

        Console.WriteLine("{0} {1}", testObj.Prop1, testObj.Prop2.Prop);

    }

}