C # public class for HTTP File Download (supports resumable upload)

Using System;
Using System. Collections. Generic;
Using System. LINQ;
Using System. text;
Using System. IO;
Using System. net;

Namespace Xcdownloadfile
{
Public Class Downloadfile
{
///
/// File Download Method
///
/// File Storage path and file name
/// Returns the Server File Name.
///
Public Bool Deownloadfile ( String Strfilename, String File)
{
Bool Flag = False ;
// Open the last downloaded file
Long Sposition = 0 ;
// Instantiate Stream Object
Filestream fstream;
// Determine whether the folder to be downloaded exists
If (File. exists (strfilename ))
{
// Open the file to be downloaded
Fstream = file. openwrite (strfilename );
// Get the downloaded Length
Sposition = fstream. length;
Fstream. Seek (sposition, seekorigin. Current );
}
Else
{
// Create a file without saving the file
Fstream = New Filestream (strfilename, filemode. Create );
Sposition = 0 ;
}
Try
{
// Open Network Connection
Httpwebrequest myrequest = (httpwebrequest) httpwebrequest. Create ( " Http://www.newxing.com/download/ " + File );
If (Sposition> 0 )
Myrequest. addrange (( Int ) Sposition ); // Set range value
// Request from the server to obtain the server's response data stream
Stream mystream = myrequest. getresponse (). getresponsestream ();
// Define a byte of data
Byte [] Btcontent = New Byte [ 512 ];
Int Intsize = 0 ;
Intsize = mystream. Read (btcontent, 0 , 512 );
While (Intsize> 0 )
{
Fstream. Write (btcontent, 0 , Intsize );
Intsize = mystream. Read (btcontent, 0 , 512 );
}
// Close stream
Fstream. Close ();
Mystream. Close ();
Flag = True ; // Returns true. Download succeeded.
}
Catch (Exception)
{
Fstream. Close ();
Flag = False ; // Returns false. Download failed.
}
Return Flag;
}
}
}