automatically produce save as file name by value in a cell

[dittotharappel]

I would like excel to automatically suggest the save as file name and location for my workbook when I click the save, save as or close options. The file name should be a combination of values in cells A1 and A2 of Sheet1. The location should be a folder named "Bill" in C:/My Documents. I think I can do it with a beforesave code but I am new to vba. Please help me.