Calling a method from a different firm in C# : I have 2 forms. First one (Form1) has a datagrid, the second one (Form2) has a button to call a function in Form1 to refresh the datagrid.

All i want to achieve is; on clicking the button in form2 , form1 datagrid should refresh (this refresh will be as a result of calling the function temp_proj )
How can i achieve this?