Passing data between windows forms

Question

Hi All
I have 3 dropdowns, two buttons (one to add data to datagrid and the other to save data to database) and a link label in form1. When I add data to datagrid (without saving) and click on link label, form2 will be opened. When I come back to form1, the data that I have added to datagrid of form1 is lost.
Please suggest me a solution for this.
Thanks in adv