debugging - c# snake game list of button -

i confused below code:

public partial class form1 : form {     struct movedata     {         public button s;         public point pos;     };     struct snake     {         public point headpos;         public list<movedata> snob;         public point posfood;     };     int limx;     int limy;     list<point> food;     list<snake> simpan;     snake temps;     movedata temd;     random rnd = new random();     public form1()     {         initializecomponent();         limx = groupbox1.width;         limy = groupbox1.height;         simpan = new list<snake>();         temps = new snake();         temps.posfood = new point();         temps.headpos = new point();         temps.snob = new list<movedata>();         temd = new movedata();         temd.s = new button();         temd.s.width = 30;         temd.s.height = 30;         //  temd.s.visible = false;         temd.pos = new point();         createsnake(150, 150, 4);      }      private void form1_load(object sender, eventargs e)     {      }     private void refreshing()     {         foreach (snake in simpan)         {             foreach (movedata in a.snob)             {                 this.groupbox1.controls.add(i.s);                 console.writeline(i.s.location.x.tostring() + " " + i.s.location.y.tostring());                 console.writeline(i.s.text);             }         }     }     private void createsnake(int x,int y, int length)     {         temps.headpos = new point(x, y);         (int = 0; < length; i++)         {             temd.s.location = new point(x, y-i*30);             console.writeline(temd.s.location.x.tostring() + " " +temd.s.location.y.tostring());             temd.pos = new point(0, 1);             temd.s.text = i.tostring();             if (i == 0)             {                 temps.headpos = new point(x, y);                 temd.s.backcolor = color.black;             }             temps.snob.add(temd);             foreach (movedata in temps.snob)             {                 console.writeline(a.s.location.x.tostring() + " " + a.s.location.y.tostring());                 console.writeline(a.s.text);             }         }          simpan.add(temps);         refreshing();     } } 

i've debugged program , stuck procedure createsnake(); procedure print button.

but when printout in list of button :

    150 150 //1'st iteration     150 150 // position of button     0       // name of button     150 120 //2 iteration     150 120// begin content of list button     1     150 120     1       // end     150 90//3 iteration     150 90 //begin position content list of button     2           150 90     2     150 90     2     // end     150 60 // 4 iteration     150 60 //begin content of position , name list of button     3     150 60     3     150 60     3     150 60     3  //end 

in end why overwrite data before it? suspect add method list can't solution for. code before incomplete there unused variable ignore it.

expected result:

    150 150     0     150 120     1     150 90     2     150 60     3 

inside createsnake() function have code

   foreach (movedata in temps.snob)     {         console.writeline(a.s.location.x.tostring() + " " + a.s.location.y.tostring());         console.writeline(a.s.text);     } 

which writes position once , calling refreshing() function, following

    foreach (movedata in a.snob)     {         this.groupbox1.controls.add(i.s);         console.writeline(i.s.location.x.tostring() + " " + i.s.location.y.tostring());         console.writeline(i.s.text);     } 

you printing co-ordinates twice in 2 different locations , that's why duplicating.