C# MouseKeyHook key suppression problems -

i've been using mousekeyhook nuget package project single key press needs monitored provide explicit functionality. prototype application have written, checks required key pressed , sets handled property true. key i'm testing launchapplication2, problem i'm having key press isn't surpressed, @ moment if microsoft word or excel in focus calculator launches!

the code follows:

    /// <summary> /// interaction logic mainwindow.xaml /// </summary> public partial class mainwindow : window {     private ikeyboardmouseevents keyboardhooklistener;      private solidcolorbrush inactivebrush = new solidcolorbrush(colors.white);      private solidcolorbrush activebrush = new solidcolorbrush(colors.lightgreen);      private bool pressed = false;      public mainwindow()     {         initializecomponent();         this.background = inactivebrush;         this.keyboardhooklistener = hook.globalevents();         this.keyboardhooklistener.keydown += keyboardhooklistener_keydown;         this.keyboardhooklistener.keyup += keyboardhooklistener_keyup;     }      void keyboardhooklistener_keyup(object sender, system.windows.forms.keyeventargs e)     {         if (e.keydata == system.windows.forms.keys.launchapplication2)         {             if (pressed)             {                 this.background = inactivebrush;                 this.displaylabel.content = string.empty;                 this.pressed = false;                 system.diagnostics.debug.writeline("*********finished*********");             }         }     }      void keyboardhooklistener_keydown(object sender, system.windows.forms.keyeventargs e)     {          // filter specific buttons using keydata property of event arguments.         if (e.keydata == system.windows.forms.keys.launchapplication2)         {             e.handled = true;             e.suppresskeypress = true;              // use flag stop code executing multiple times whilst key pressed keydown keeps firing.             if (!pressed)             {                 system.diagnostics.debug.writeline("*********started*********");                 this.pressed = true;                 this.background = activebrush;                 this.displaylabel.content = e.keydata.tostring();             }         }     }      private void window_closing(object sender, system.componentmodel.canceleventargs e)     {         this.keyboardhooklistener.keydown -= this.keyboardhooklistener_keydown;         this.keyboardhooklistener.keyup -= this.keyboardhooklistener_keyup;          this.keyboardhooklistener.dispose();     } } 

i've tried using suppresskeypress property doesn't have effect. explanations or proposals fix great!