c# - Using Directives or Assembly Reference -

c# - Using Directives or Assembly Reference -

i added buttons form, doubled clicked wrong 1 , took me code editor.

i decided delete generated code resulted clicking wrong button. did rebuild , ended getting error:

error 1 'xxxxx' not contain definition 'xxxxx' , no extension method 'subtraction_checked' accepting first argument of type 'xxxx' found (are missing using directive or assembly reference?)

how resolve this?

when double click on button, creates event handler in designer generated code as:

this.button1.click += new system.eventhandler(this.button1_click);

and in code editor see this:

private void button1_click(object sender, eventargs e) { }

now, if remove handler, error. resolve need remove event designer generated code i.e. this.button1.click += new system.eventhandler(this.button1_click);

same goes checkboxes, textboxes , other controls well.

c# winforms