title: how to call a .cs file from main form in csharp
body: <p>I want to call a .cs file from my form1.cs file.</p>
  
  <p>I have written a minimize to system tray code in sys_tray.cs file and so when I clicked to minimize option on form1.cs a new form resize function will be called and in that function I want to call the sys_tray.cs file. How do I do this?</p>