how to populate a gridview with selected rows of other gridview

protected void btnGo_Click(object sender, EventArgs e)
{
	DataTable dt = GridView1.DataSource;
	DataView dv = new DataView(dt, "TotalEmployees > 0", "Department", DataViewRowState.CurrentRows);
	GridView2.DataSource = dv;
	GridView2.DataBind();
}