How to get the combobox value to another form....

form1 is having combobox..having value member displayed from database.... the value member called refid form2 is having datagrid...when ever we click a button basing on the refid...the id details will be displayed on the form2 DATAGRID.... but in my application updatin of datagrid is not possible...because the combobox.selectedvalue is not coming to form2...why please tell me.....If possible give me the code...

These are the two files...when i click salary button new form will be opened.....

in datagrid form...when we click the update button the data will be updated....here the task is Combobox in viewdetails form is not coming to the datagrid form.....

Please help me...