private void OpenConnection()
	{
		if (objConn == null)
		{
			objConn = new SqlConnection(connectionString);
			objConn.Open();
		}
	}
	private void CloseConnection()
	{
		if (objConn != null)
		{
			objConn.Close();
			objConn.Dispose();
			objConn = null;
		}
	}