C# cancel button function

I want to do a cancel button that can return back the form for first look.(NOT previous form)

For example:I had a interface then I click add button to add data,I will make my edit button disable.when I don't want to add data,or need to edit my data,I need to click the cancel button to return the form first appearance.(mean before edit button disable)

Please teach me how to do this function...thanks!!!