data_view.RowFilter = "Convert([order_number], 'System.String') LIKE '%" + txtOrderNumber.Text + "%'";
if not integer
data_view.RowFilter = "[order_number] LIKE '%" + txtOrderNumber.Text + "%'";
data_view.RowFilter = "Convert([order_number], 'System.String') LIKE '%" + txtOrderNumber.Text + "%'";
if not integer
data_view.RowFilter = "[order_number] LIKE '%" + txtOrderNumber.Text + "%'";