hi
doing a project in ftp. while uploading a file when the network gets disconnected ,while resuming upload it must start from the place where the last byte was written im using ftpwebrequest class but it gives me error "File unavailable error code 550" below is my code.

if (System.IO.File.Exists(file_to_upload))

{

//FtpWebResponse response;

try

{

int Appendinglength = 0;

int TotalLength = 0;

pointer = 0;

long FTPFilesize = 0;

FileInfo finfo = new FileInfo(file_to_upload);

TotalLength =

Convert.ToInt32(finfo.Length);

FtpWebRequest ftprequest;

ftprequest = (

FtpWebRequest)FtpWebRequest.CreateDefault(new Uri("ftp://" + IP + "/" + finfo.Name));

ftprequest.Credentials =

new NetworkCredential(Uname, Pwd);

ftprequest.UseBinary =

true;

ftprequest.KeepAlive =

false;

//if (ISFtpFileExists(finfo.Name, out FTPFilesize))

//{

// //ftprequest.Method = WebRequestMethods.Ftp.AppendFile;

// ftprequest.Method = WebRequestMethods.Ftp.UploadFile;

//}

//else

//{

ftprequest.Method =

WebRequestMethods.Ftp.UploadFile;

//}

//ftprequest.ContentLength = finfo.Length - FTPFilesize;

ftprequest.UsePassive =

false;

ToWriteStream = ftprequest.GetRequestStream();

//response = (FtpWebResponse)ftprequest.GetResponse();

FileStream fst = new FileStream(file_to_upload, FileMode.Open);

fst.Seek(FTPFilesize,

SeekOrigin.Begin);

byte[] buffer = new byte[bufferLength];

pointer = fst.Read(buffer, 0, bufferLength);

while (pointer != 0)

{

ToWriteStream.Write(buffer, 0, pointer);

Appendinglength += pointer;

PrgUpdate(CalculateProgress(Appendinglength, TotalLength));

pointer = fst.Read(buffer, 0, bufferLength);

}

ToWriteStream.Close();

fst.Close();

}

catch (WebException ex)

{

FtpWebResponse response = ex.Response as FtpWebResponse;

Exoccur(response.StatusCode.ToString());

Exoccur(ex.Message);

//response.Close();

}

catch (Exception ex)

{

Exoccur(ex.Message);

return false;

}

finally

{

//ToWriteStream.Close();

////response.Close();

}

}

else

{

Exoccur(

"File Doesnt occur");

}

return true;

}

Following link will help you to upload file with resume support

http://www.codeproject.com/KB/IP/ftplib.aspx

---

Gaurav Khanna

it wont works,it contains code for upload only,not a broken upload

I found out the answer atlast it will works

public

bool UploadFile(string file_to_upload,int attempts)

{

if (System.IO.File.Exists(file_to_upload))

{

//FtpWebResponse response;

int Appendinglength = 0;

int TotalLength = 0;

pointer = 1;

long FTPFilesize = 0;

while (--attempts >= 0)

{

try

{

FileInfo finfo = new FileInfo(file_to_upload);

TotalLength =

Convert.ToInt32(finfo.Length);

FtpWebRequest ftprequest;

ftprequest = (

FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + IP + "/" + finfo.Name));

ftprequest.Credentials =

new NetworkCredential(Uname, Pwd);

ftprequest.UseBinary =

true;

ftprequest.KeepAlive =

false;

if (ISFtpFileExists(finfo.Name, out FTPFilesize))

{

ftprequest.Method =

WebRequestMethods.Ftp.AppendFile;

//ftprequest.ContentLength = finfo.Length - FTPFilesize;

//ftprequest.Method = WebRequestMethods.Ftp.UploadFile;

}

else

{

ftprequest.Method =

WebRequestMethods.Ftp.UploadFile;

}

ftprequest.UsePassive =

false;

ToWriteStream = ftprequest.GetRequestStream();

//response = (FtpWebResponse)ftprequest.GetResponse();

fstr =

new FileStream(file_to_upload, FileMode.Open);

fstr.Seek(FTPFilesize,

SeekOrigin.Begin);

byte[] buffer = new byte[bufferLength];

pointer = fstr.Read(buffer, 0, bufferLength);

startuptime =

DateTime.Now;

Exoccur(

"Resuming Upload..");

while (pointer != 0)

{

ToWriteStream.Write(buffer, 0, pointer);

Appendinglength += pointer;

int prg = CalculateProgress(Appendinglength, TotalLength);

PrgUpdate(prg);

//lblupdate(prg);

pointer = fstr.Read(buffer, 0, bufferLength);

}

break;

}

catch

{

}

}

enduptime =

DateTime.Now;

ToWriteStream.Close();

fstr.Close();

TimeSpan timetaken = enduptime.Subtract(startuptime);

double d = timetaken.TotalMilliseconds;

d = d / 1000;

Exoccur(

Convert.ToString(d));

}

else

{

Exoccur(

"File Doesnt occur");

}

return true;

}