c# - Object reference not set to an instance of an object using ( READTOEND) -

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i have following code download txt file using ftp , write file.

 ftp = (ftpwebrequest)webrequest.create("ftp://" + ftphost + ftpdir + "/sapvalidobjects.txt");  ftp.method = webrequestmethods.ftp.downloadfile;  ftp.usebinary = false;  ftp.credentials = new networkcredential(ftpuserid, ftppwd);  ftpwebresponse response = (ftpwebresponse)ftp.getresponse();  stream sresponse = response.getresponsestream();  streamreader srsapcostobjects = new streamreader(sresponse);  m_swsapcostcentres.write(srsapcostobjects.readtoend());  m_swsapcostcentres.close();  response.close();   m_swsapcostcentres = new streamwriter(properties.settings.default.sapint + @"\sapcostcentres" + ".txt");

in reason throws exception @ 

 m_swsapcostcentres.write(srsapcostobjects.readtoend());

am not sure why,some 1 please guide me.

i guess issue file trying write exists , opened application.

try delete file:

properties.settings.default.sapint + @"\sapcostcentres" + ".txt"

if exists, before trying create again.

in code should add try catch , make sure either use using statement wrap disposable objects or call close method in catch or block streams , other objects closed.


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