What does this code do? What is the result of the following code?



 string strPath1 = "oldfile.txt";

 string strPath2 = "newfile.txt";

 string strLine;



 StreamWriter objStreamWriter;

 objStreamWriter = new StreamWriter( strPath2 );



 StreamReader objStreamReader;

 objStreamReader = new StreamReader( strPath1 );



 while ( objStreamReader.Peek() > -1 )

 {

 strLine = objStreamReader.ReadLine();

 objStreamWriter.WriteLine( strLine );

 }



 objStreamWriter.Close();

 objStreamReader.Close();

The code copies the contents of oldfile.txt to newfile.txt. After the file trans-

fer is completed, the files are closed by closing the StreamReader and StreamWriter. Note that if a blank line is encountered, copying stops at the blank line. The complete code reads:




 // CopyFile.cs





 using System;


 using System.Drawing;


 using System.Collections;


 using System.ComponentModel;


 using System.Windows.Forms;


 using System.Data;


 using System.IO;





 namespace CopyFile


 {


 /// 


 /// Summary description for FrmCopyFile.


 /// 



 public class FrmCopyFile : System.Windows.Forms.Form


 {


 private System.Windows.Forms.Label lblCopy;


 private System.Windows.Forms.Label lblOriginal;


 private System.Windows.Forms.TextBox txtCopy;


 private System.Windows.Forms.TextBox txtOriginal;


 /// 


 /// Required designer variable.


 /// 



 private System.ComponentModel.Container components = null;





 public FrmCopyFile()


 {


 //


 // Required for Windows Form Designer support


 //


 InitializeComponent();





 //


 // TODO: Add any constructor code after InitializeComponent


 // call


 //


 }





 /// 


 /// Clean up any resources being used.


 /// 



 protected override void Dispose( bool disposing )


 {


 if( disposing )


 {


 if (components != null)


 {


 components.Dispose();


 }


 }


 base.Dispose( disposing );


 }





 // Windows Form Designer generated code





 /// 


 /// The main entry point for the application.


 /// 



 [STAThread]


 static void Main()


 {


 Application.Run( new FrmCopyFile() );


 }





 // copies newfile.txt to oldfile.txt and displays both


 private void FrmCopyFile_Load(


 object sender, System.EventArgs e )


 {


string strPath1 = "oldfile.txt";


string strPath2 = "newfile.txt";


string strLine;


StreamWriter objStreamWriter;


objStreamWriter = new StreamWriter( strPath2 );


StreamReader objStreamReader;


objStreamReader = new StreamReader( strPath1 );


while ( objStreamReader.Peek() > -1 )


{


strLine = objStreamReader.ReadLine();


objStreamWriter.WriteLine( strLine );


}


objStreamWriter.Close();


objStreamReader.Close();





 // display both files in TextBoxes


 objStreamReader = new StreamReader( strPath1 );





 while ( objStreamReader.Peek() > -1 )


 {


 strLine = objStreamReader.ReadLine();


 txtCopy.Text += strLine; + "\r\n";


 txtOriginal.Text += strLine + "\r\n";


 }





 objStreamWriter.Close();


 objStreamReader.Close();





 } // end method FrmCopyFile_Load





 } // end class FrmCopyFile


 }