Whats the output of this code?

Question

 object nullobject = null;
 object myobject = new myobject();
 console.writeline("nullobject="+nullobject+"myobject="+myobject);

Answer 1

It (unexpectedly for me, anyway) prints

nullobject=myobject=System.Object

(changing your = new myobject(); line to = new object(); and correcting other typos.)

The thing I didn't know (and the reason I'm bothering to post this) is CSharp treats null string objects as empty strings when concatenating. There's a note halfway down this page about it. http://msdn.microsoft.com/en-us/library/ms228504.aspx

object nullobject = null;
object myobject = new object();
Console.WriteLine(nullobject + "");         //ok, prints empty line
Console.WriteLine(nullobject.ToString());   //this will blow up
Console.WriteLine("nullobject=" + nullobject + "myobject=" + myobject); //ok, prints what's above.