How to crete Dialog Box

Question

Can anyone help on how to crete an a "Save" function on C#, I'm trying to write a dialog box and I've managed to do the "Open" and "CLose" etc but I'm strugling to write a "Save". To explain more, on MSWord when you click on "File" a sub menu will appear with "Open" ...anyone who can help me o guide me on tutorials that similar to tath. Enkosi Sakhumzi