visual studio - I can't seem to change the window form text in C# -

i'm using visual studio create program. far, has 1 window button.

in form1.designer.cs, initializes window:

namespace test {     private void initializecomponent()     {         // took out else, isn't needed.          //          // formmain         //          this.autoscaledimensions = new system.drawing.sizef(6f, 13f);         this.autoscalemode = system.windows.forms.autoscalemode.font;         this.backcolor = system.drawing.systemcolors.controllightlight;         this.clientsize = new system.drawing.size(624, 442);         this.icon = ((system.drawing.icon)(resources.getobject("$this.icon")));         this.name = "formmain";         this.text = "program name";         this.load += new system.eventhandler(this.formmain_load);         this.menubar.resumelayout(false);         this.menubar.performlayout();         this.resumelayout(false);         this.performlayout();      } } 

in form1.cs:

    private void button1_click(object sender, eventargs e)     {         formmain.activeform.text = formmain.activeform.text + " - project name";     } 

...but doesn't change window text after click button. i've tried formmain.activeform.refresh() after changing text, didn't work. i've search high , low solution, i'm new c#. of have ideas me?

did try that?

private void button1_click(object sender, eventargs e) {     this.text = "works!"; }