C# Destructor not calling after out of scope -

i have problem destructor after going out of scope(it calling after time , need make action on form, example change radio button), maybe there's mistake in code. take look:

namespace windowsformsapplication2 {     public partial class form1 : form     {          public form1()         {             initializecomponent();             eventlogger.print += delegate(string output)             { if (!textbox1.isdisposed) this.invoke(new methodinvoker(() => textbox1.appendtext(output + environment.newline)), null); };         }          private void button1_click(object sender, eventargs e)         {             testclass test = new testclass();         }     }     public static class eventlogger     {         public delegate void eventhandler(string output);         public static event eventhandler print;         public static void addlog(string textevent)         {             print(textevent);         }     }     public class testclass     {         public testclass()         {             eventlogger.addlog("testclass()");         }         ~testclass()         {             eventlogger.addlog("~testclass()");         }     }  } 

right, because isn't c++. finalizer (not destructor in c++) not guaranteed called after object has left declaring scope, called when gc decides swoop in , clean after you.

may ask why using finalizer begin with? maintaining references unmanaged resources need deallocated deterministically possible (if so, read on idisposable interface)? use cases c# finalizers few , far between, it's not common implement them.