c\#데이터베이스 와 TXT 가 져 오기 내 보 내기 인 스 턴 스

     private void button1_Click(object sender, EventArgs e)         
     {             
     if (openFileDialog1.ShowDialog() == DialogResult.OK)   
     {          
     using (FileStream fs = File.OpenRead(openFileDialog1.FileName))  
     {               
     using (StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding("GB2312")))    
     {
     //<span style="color:#3333ff;">        System.Text.Encoding.GetEncoding("GB2312")，
       string name = arr[0]  name    </span>                           using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='|DataDirectory|\dd.mdf';
     Integrated Security=True;User Instance=True"))   
     {
     //<span style="color:#3333ff;">DataDirectory           ，winForm   Program.cs      ，   .NET            ，               why</span>                             
     conn.Open();                     
     using (SqlCommand cmd = conn.CreateCommand())       
     {                          
     cmd.CommandText = "insert into T_Persons values(@Name,@Age)"; 
     string line = "";       
     while ((line = sr.ReadLine()) != null)   
     {                 
     string[] arr = line.Split('|');       
     string name = arr[0];            
     int age = Convert.ToInt32(arr[1]);  
     cmd.Parameters.Clear();//             
     cmd.Parameters.Add(new SqlParameter("Name", name));  
     cmd.Parameters.Add(new SqlParameter("Age", age));   
     cmd.ExecuteNonQuery();        
     }                     
     }                     
     }                    
     }                
     }                
     MessageBox.Show("txt       !");    
     }                
     }         
     private void button2_Click(object sender, EventArgs e)     
     {             
     if (saveFileDialog1.ShowDialog() == DialogResult.OK)      
     {                  
     using (FileStream fs = File.OpenWrite(saveFileDialog1.FileName))  
     {                   
     using (StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.GetEncoding("GB2312")))     
     {                      
     using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='|DataDirectory|\dd.mdf';Integrated Security=True;User Instance=True"))                          
     {                          
     conn.Open();        
     using (SqlCommand cmd = conn.CreateCommand())      
     {                              
     cmd.CommandText = "select * from T_Persons";    
     using (SqlDataReader sdr = cmd.ExecuteReader())     
     {                                             
     while (sdr.Read())               
     {                               
     string name = sdr.GetString(sdr.GetOrdinal("Name")); 
     int age = sdr.GetInt32(sdr.GetOrdinal("Age"));   
     string line =name+"|"+age;                      
     sw.WriteLine(line);                           
     sw.Flush();                        
     }                                      
     }                       
     }                  
     }                   
     }              
     }           
     MessageBox.Show("     txt  ！");   
     }         
     }
     </span>  

static void Main()         
{           
string dataDir = AppDomain.CurrentDomain.BaseDirectory;       
if (dataDir.EndsWith(@"\bin\Debug\") || dataDir.EndsWith(@"\bin\Release\"))   
{                 
dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;   
AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);     
}                
Application.EnableVisualStyles();  
Application.SetCompatibleTextRenderingDefault(false);     
Application.Run(new Form1());     
}