Object Reference Error RSS

• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Object Reference Error

  Apr 30, 2012 09:48 AM|LINK

  I have coding like this for webservice  its no error when build, but it show object references not set to an instance of that object error ,
  
  protected void Page_Load(object sender, EventArgse)

  {

  string strURL = null;

  string strResult = null;

  HttpWebRequest wbrq = null;

  HttpWebResponse wbrs = null;

  StreamReader sr = null;

  strURL ="http://aspnetlibrary.com/articles.aspx?Page=1";

  wbrq = (HttpWebRequest)WebRequest.Create(strURL);

  wbrq.Method ="GET";

  sr =new StreamReader(wbrs.GetResponseStream());//Error Null error occurs here ?

  strResult = sr.ReadToEnd().Trim();

  sr.Close();

  TextBox1.Text = strResult;

  }

  public void Default1()

  {

  Load += Page_Load;

  }

  • Edited by maddyrafi8975 on Apr 30, 2012 09:50 AM
• • Reply
  

  tusharrs

  Contributor

  3230 Points

  668 Posts

  Re: Object Reference Error

  Apr 30, 2012 09:56 AM|LINK

  
  hi,

  try this code

   

  HttpWebRequest wbrq = null;

  HttpWebResponse wbrs = null;

  StreamReader sr = null;

  string strURL = http://aspnetlibrary.com/articles.aspx?Page=1;

  wbrq = (HttpWebRequest)WebRequest.Create(strURL); 

  wbrq.Method ="GET";

  wbrs = (HttpWebResponse)wbrq.GetResponse();

  sr = new StreamReader(wbrs.GetResponseStream());

  string strResult = sr.ReadToEnd().Trim();

  sr.Close();

  Regards
  
  ( Mark as Answer if it helps you out )
  
  View my Blog
  • Edited by tusharrs on Apr 30, 2012 09:56 AM
  • Marked as answer by maddyrafi8975 on Apr 30, 2012 10:04 AM
• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:01 AM|LINK

  Thank You, Then what i will get output from this code ? kindly tel me pls...

• • Reply
  

  AidyF

  Star

  9204 Points

  1570 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:02 AM|LINK

  Your line should be something like

  sr = new StreamReader(wbrq.GetResponse().GetResponseStream());

  In your code you are accessing wbrs which is the response, yet you haven't retrieved the response yet so that variable is a null reference.
  
  

  • Marked as answer by maddyrafi8975 on Apr 30, 2012 10:05 AM
• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:05 AM|LINK

  Thank You, Then what i will get output from this code ? kindly tel me pls...

• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:15 AM|LINK

  protected void Page_Load(object sender, EventArgs e)

  {

  string strURL = "";

  string strPostData = "";

  string strResult = "";

  HttpWebRequest wbrq = null;

  HttpWebResponse wbrs = null;

  StreamWriter sw = null;

  StreamReader sr = null;

  strURL =http://www.webcom.com/cgi-bin/form;

  strPostData =string.Format("your_name={0}&userid={1}&form_name={2}", "Mark Smith", "webcom", "tutortest");

  wbrq.Method ="POST";//Same object reference error

  wbrq.Referer ="http://www.webcom.com/cgi-bin/form";

  wbrq.ContentLength = strPostData.Length;

  wbrq.ContentType ="application/x-www-form-urlencoded";

  sw =new StreamWriter(wbrq.GetRequestStream());

  sw.Write(strPostData);

  sr =new StreamReader(wbrs.GetResponseStream());

  strResult = sr.ReadToEnd().Trim();

  TextBox1.Text = strResult;

  }

  public Default1()

  {

  Load += Page_Load;

  }

  sr.Close();

  sw.Close();

• • Reply
  

  tusharrs

  Contributor

  3230 Points

  668 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:23 AM|LINK

  hi,

  i think you are missing this line

  wbrq = (HttpWebRequest)WebRequest.Create(strURL);

  before this line

  wbrq.Method ="POST";//Same object reference error

  Regards
  
  ( Mark as Answer if it helps you out )
  
  View my Blog
  • Marked as answer by maddyrafi8975 on Apr 30, 2012 10:28 AM
• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:29 AM|LINK

  i get output just html this output is correct na ?

• • Reply
  

  AidyF

  Star

  9204 Points

  1570 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:32 AM|LINK

  Yes, that is what you will get.  If you paste the url into your browser then select "View Source", that is basically what your code is doing.

  • Marked as answer by maddyrafi8975 on Apr 30, 2012 10:36 AM
• • Reply
  

  maddyrafi897...

  Member

  134 Points

  300 Posts

  Re: Object Reference Error

  Apr 30, 2012 10:36 AM|LINK

  Yes Thank You so much...