public static void Close()
{
if (cn != null)
{
cn.Close();
cn = null;
}
if (me != null)
{
me =null;
}
}
public static DBHelper getInstance(string connectionString)
{
if (cn == null)
{
cn = new OleDbConnection(connectionString);
}
if (cn.State != ConnectionState.Open)
{
cn.Open();
}
if (me == null)
{
me = new DBHelper();
}
return me;
}