How to disable the right-click context menu on textboxes in Windows, using C#?

try with

textBox1.ShortcutsEnabled =false;

Use the ShortcutsEnabled property to enable or disable the following shortcut key combinations and the control’s shortcut menu:

• CTRL+Z

• CTRL+E

• CTRL+C

• CTRL+Y

• CTRL+X

• CTRL+BACKSPACE

• CTRL+V

• CTRL+DELETE

• CTRL+A

• SHIFT+DELETE

• CTRL+L

• SHIFT+INSERT

• CTRL+R

Try to do this:

textBoxt1.ContextMenu = new ContextMenu();