JO>class TestClass1
JO>{
JO>    int _prop; // You need a member variable for storing the property's value
JO>    public TestClass1()
JO>    {
JO>        Console.WriteLine("TestClass1 started");
JO>        prop=1;
JO>    }
JO>    public int prop
JO>    {
JO>        get
JO>        {
JO>            return _prop;
JO>        }
JO>        set
JO>        {
JO>            _prop = value; // This will work correctly
JO>        }
JO>    }        
JO>    public void Trace()
JO>    {
JO>        Console.WriteLine("The value is {0}", prop);
JO>    }
JO>}
JO>