using System;

public class Test
{
	public bool Prop { get; set; }
	
	public static void Main()
	{
		Test obj = new Test();
		// this is working but I can't have it on one line
		if (obj != null)
		{
			obj.Prop = true;
		}
		
		// this is not working
		// t?.Prop = true;
	}
}