c# - Do anyone know why I'm getting Null exception error? -

i keep on getting null exception. instantiated myhello inside program , still gives me error. in advance.

class hello {     public dictionary<int, string> one;     public dictionary<int, ushort> two;     public dictionary<int, bool> three;      public hello()     {         this.one = new dictionary<int, string>();         this.two = new dictionary<int, ushort>();         this.three = new dictionary<int, bool>();     }      public dictionary<int, object> values     {         get;         set;     }      public object this[int index]     {                 {             return this.values[index];         }         set         {             this.values[index] = value;         }     } }     class program {     public static void myfun(ref hello hu)     {         hu[0] = "hello";         hu[1] = 25;         hu[2] = true;     }      static void main(string[] args)     {         try         {             //program myprog = new program();             var myhello = new hello[2];             myhello[0] = new hello();             myhello[1] = new hello();              myhello[1][1] = 2;             myfun(ref myhello[1]);             console.writeline("" + (hello)(myhello[1])[1]);              console.readkey();         }         catch (nullreferenceexception ex)         {             console.writeline(ex.message);             console.readkey();         }     } } 

values never assigned default value , think trying access values property before assigning value.

change constructor to:

public hello() {     this.one = new dictionary<int, string>();     this.two = new dictionary<int, ushort>();     this.three = new dictionary<int, bool>();     this.values = new dictionary<int, object>(); }