keypress - Press a C# Application button from keyboard -

i have sample c# application have 4 buttons this:

i want when press button respective others pressed correspondent button c# application (when window focused) , keeps being pressed simultaneously keyboard. how this? i've tried keyeventargs , keypress think i'm little bit confused.

le: , have possibility press 2 buttons simultaneously:

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edit later: can't understand. i've created new project. whole code is:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace test3 {     public partial class form1 : form     {         public form1()         {             initializecomponent();             this.keydown += form1_keydown;         }          private void form1_keydown(object sender, keyeventargs e)         {             if (e.keycode == keys.up) { messagebox.show("|"); }         }     } } 

this whole code of new project, why isn't showing te message box when press button keybard? working letters...

according up, down, left , right arrow keys not trigger keydown event:

protected override bool processcmdkey(ref message msg, keys keydata) {     switch (keydata)     {         case keys.right:             button1.performclick();             return true;         case keys.left:              //...         default:             return base.processcmdkey(ref msg, keydata);     } }