private void BtnSell_Click(object sender, EventArgs e)
{
FrSellProduct frSell = new FrSellProduct();
frSell.ProductID = ProductID;
frSell.EmployeeID = EmployeeID;
frSell.Visible = true;
this.Visible = false;
}
private void BtnXemChiTiet_Click(object sender, EventArgs e)
{
int r = dgvProduct.CurrentRow.Index;
FrSellProduct frSell = new FrSellProduct();
frSell.EmployeeID = EmployeeID;
FrDetailProduct frDP = new FrDetailProduct();
frDP.ProductID = Convert.ToInt32(dgvProduct.Rows[r].Cells[0].Value.ToString());
frDP.EmployeeID = EmployeeID;
frDP.Show();
}