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using System.Data.SqlClient;
string sql = "server=.;uid=sa;pwd=;database=tablename;";
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using System.Data.OleDb;
string sql = "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA Source=" + HttpRuntime.AppDomainAppPath + "//App_Data//db.mdb";
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import java.io.*;
import java.sql.*;
public class DBConn {
 private String ADDRESS ;
 private int PORT ;
 private String DBNAME ;
 private String USERNAME ;
 private String PASSWORD ;
 private Connection conn ;
 private PreparedStatement pstmt ;
 pri ......

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using System;   
using System.Collections.Generic;   
using System.Text;   
using System.Security.Cryptography;//CryptographyÃÜÂëÊõ   
namespace DAL   
{   
......
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