change grid view data source from another form

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C#

C#4.0

I've two forms (frmMain and frmSearch)

frmMain have DataGrid and button controls, the button showing frmSearch to search and return datatable, and frmMain is still open.

when frmSearch returns datatable with search result i want fill with this datatable so i write this code

using (frmMain MainForm = new frmMain()
            {
                MainForm.ShowDialog();
                gvExams.DataSource = myDataTable;
            }

so the form instantiated a new form and DataGrid have nothing.

i want convert my DataGrid Control to a static Control (i can't). or Help Me...