private static SqlConnection conn;// = new SqlConnection(@"Data Source=SP-47C50C180EE0\DUONGDX;AttachDbFilename=D:\c#\project\Super Market Management\Super Market Management\spMarketmgmt.mdf;Integrated Security=True");
public frmThemNhaCC()
{
InitializeComponent();
conn = new SqlConnection(ConnectionString.getConnect());
}