How to use eneter key to submit a form in windows form C#

If you set the Form's AcceptButton property to some button, then this will automatically click that button (and execute the corresponding code) when the user presses the ENTER key:

http://msdn.microsoft.com/en-us/library/system.windows.forms.form.acceptbutton(v=vs.110).aspx

you can set "DefaultProperty" to true, e.g.,