源代码如下：
using System;using System.Data;using System.Data.OleDb;using System.IO;using System.Windows.Forms;namespace Test{class Database{public static bool DataBase_Exists(){if (!File.Exists(Application.StartupPath + "\\DataBase.mdb")){return false;}else{return true;}}public OleDbConnection Get_Conn(){try{string Conn_String = "";Conn_String = "Data Source='DataBase.mdb'; Provider=Microsoft.ACE.OLEDB.12.0;";OleDbConnection Db_Conn = new OleDbConnection(Conn_String);Db_Conn.Open();return Db_Conn;}catch (Exception e){Error.Database_Error_Conn = e.Message.ToString();return null;}}public OleDbDataReader Select(string Select_String){try{if (Get_Conn() == null){return null;}OleDbCommand Db_Cmd = new OleDbCommand(Select_String, Get_Conn());OleDbDataReader Db_Reader = Db_Cmd.ExecuteReader();Db_Reader.Read();return Db_Reader;}catch (Exception e){Error.Database_Error_Select = e.Message.ToString();return null;}}public int Action_The_SQL(string SQL_String){try{if (Get_Conn() == null){return 0;}OleDbCommand Db_Cmd = new OleDbCommand(SQL_String, Get_Conn());int Line = Db_Cmd.ExecuteNonQuery();return Line;}catch (Exception e){Error.Database_Error_Action_The_SQL = e.Message.ToString();return 0;}}public DataSet GetDataSet(string SQL_String, string tableName){try{if (Get_Conn() == null){return null;}OleDbDataAdapter Adapter = new OleDbDataAdapter(SQL_String, Get_Conn());DataSet DS = new DataSet();Adapter.Fill(DS, tableName);return DS;}catch (Exception j){Error.Database_Error_GetDataSet = j.Message.ToString();return null;}}public string GetData(string SQL_String){try{if (Get_Conn() == null){return null;}OleDbCommand Db_Cmd = new OleDbCommand(SQL_String, Get_Conn());string data = Convert.ToString(Db_Cmd.ExecuteScalar());return data;}catch (Exception e){Error.Database_Error_Action_The_SQL = e.Message.ToString();return null;}}}}
其引用的错误（Error）类源代码如下：
namespace Test{class Error{public static string Database_Error_Select;public static string Database_Error_Conn;public static string Database_Error_Action_The_SQL;public static string Database_Error_GetDataSet;}}
，答：他是憋死的，因为沙漠里没有电线杆撒尿。问：
