Lập trình

 { string connectionString =  "Data Source=.;

Initial Catalog=HSDB;

 Integrated Security=SSPI;";

SqlConnection conn = new SqlConnection(connectionString);

DataSet ds = new DataSet();

Try

 {

if (conn.State == ConnectionState.Closed)

{ conn.Open(); }

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

 cmd.CommandText = "select MaLop, TenLop from Lop";

cmd.Connection = conn;

using(SqlDataAdapter adapter = new SqlDataAdapter(cmd))

 { adapter.Fill(ds, "Lop"); }

this.ddlLop.DataSource = ds;

this.ddlLop.DataMember = "Lop";

this.ddlLop.DataTextField = "TenLop";

this.ddlLop.DataValueField = "MaLop";

this.ddlLop.DataBind();

return true;

}

catch { return false; }

finally { conn.Close(); }

}