C# object reference not set to an instance of an object.

Question

I am getting the object reference error in just start of the method.

For Ex.:

259: public ActionResult ShowAddress(FormCollection formCollection)
260: {

In the above sample i am getting the error Line number 260.

Please anyone can suggest me the problem with this.

Answer 1

Finally, Enough information to attempt to post an answer...

I suppose formCollection must be null.

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Answer 2

Here is the code from the question comments

259: public ActionResult ShowAddress(FormCollection formCollection) { 
260:   long _userId= long.Parse(formCollection["UserId"].ToString()); 
261:   UserDetails _userDetails = _userDAL.GetUserDetails(_userId); 
262:   if(!string.IsNullOrEmpty(_userDetails.Address1)) return  RedirectToAction("GetAddress", "User"); else return View(); }

If you're seeing a NullReferenceException at line 260, either formCollection or the result of formCollection["UserId"] is null. You need to account for this in your code. For instance you could do the following.

public ActionResult ShowAddress(FormCollection formCollection) {
  if ( null == formCollection ) { 
    return View();
  }
  object obj = formCollection["UserId"];
  if ( null == obj ) {  
    return View();
  }
  long _userId = long.Parse(obj.ToString());
  ...
}