WebService's simple encapsulation interface call method

This method completes the simple call encapsulation of a simple WebService, implements the unified operation of simple Webservice calls, and avoids the embarrassment of adding an interface method for every additional operation!

/// &lt;summary&gt;
  /// Encapsulate the same interface call method  /// &lt;/summary&gt;
  /// <param name="_strSql">Simple sql passed in</param>  /// <param name="_strConnNmae">Connect database string</param>  /// <returns>Returned dataset</returns>  [WebMethod]  
  public DataSet GeneralDataSet(string _strSql, string _strConnNmae)
  {
    DataSet dsResult = null;
    //Connect the HIS database string    ConnectionStringSettings css = new ConnectionStringSettings();
    css = [_strConnNmae];
    using (OleDbConnection conn = new OleDbConnection())
    {
      ();
      OleDbCommand cmd = ();
      using (OleDbDataAdapter ada = new OleDbDataAdapter())
      {
        try
        {
           = _strSql;
           = cmdHIS;
          (dsResult);
        }
        catch (Exception ex)
        {
        }
      }
    }
    return dsResult;
  }

<configuration>
  <appSettings>
    <add key="EmrSoapRole" value="/EMR"/>
  </appSettings>
  <connectionStrings>
     
    <add name="HISConnectionString" connectionString="Data Source=DLFY;Persist Security Info=True;Password=medrec;User ID=medrec" providerName=""/>

//Call ExampleDataSet ds = GeneralDataSet("select * from emp","HisConnectionString");

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