<connectionStrings>
      <add name="AttendManager.Properties.Settings.ConnectionString"
            connectionString="Dsn=AttendManager;dbq=\DB\db.mdb;driverid=25;fil=MS    Access;maxbuffersize=2048;pagetimeout=5;uid=admin"
            providerName="System.Data.Odbc" />
    </connectionStrings>

  private void LoginFrm_Load(object sender, EventArgs e)
        {
          //this.用户TableAdapter.Fill(this.dataSet1.用户);

            string m_connection = new OdbcConnection("Dsn=AttendManager");
            m_connection.Open();
            GetUsers();
        }