I have a webservice that authenticates a client against clientcode, email and
password stored in mssql database. Now I am trying to consume it in my
iPhone app. I am trying to serialize the output returned by the web methods
and write to a file on the Personal folder on my machine. Then read a
certain node from it and show some form of welcome message when the
authentication is successful. Here is the code block which I am using, but I
am getting a NullReferenceEsxception: Object reference not set to an
instance of an object on the marked line. Can you guys tell me where I am
going wrong? Here ASTONAPPService is the name of the service that I have
added to my project. And GetLoginUser() is the exposed webmethod. Neither is
the directory being created nor is the xml file being written. I am just a
beginner, so I haven't got much clue either.
if(ValidateControls ())
{
ASTONAPPService.IPADService objipad=new
ASTONAPP.ASTONAPPService.IPADService();
ASTONAPPService.BLL_User user=objipad.GetLoginUser(txtClientCode.Text,
txtEmail.Text, txtPassword.Text);
if(user!=null)
{
System.Xml.Serialization.XmlSerializer xx=new
XmlSerializer(user.GetType
());
string
pathtowrite=Environment.GetFolderPath(Environment.SpecialFolder.Personal);
var dirName=Path.Combine (pathtowrite, "ASTON Repository");
if(!Directory.Exists (dirName))
{
Directory.CreateDirectory (dirName);
}
var filepath=Path.Combine (dirName, "BLL_User.xml");
if(File.Exists (filepath))
{
File.Delete (filepath);
}
TextWriter txtW=new StreamWriter(filepath);
xx.Serialize (txtW, user);
txtW.Close ();
string clientcode=txtClientCode.Text;
XDocument xdoc=XDocument.Load (filepath);
var usrnm=xdoc.XPathSelectElement(String.Format
("BLL_User[DiyCode={0}]/UserName", clientcode));
UIAlertView uvm=new UIAlertView("Notification",
""+usrnm.ToString ()+"",
null, "OK", null);
uvm.Show ();
this.ash=new AssessmentsHome();
this.NavigationController.PushViewController (this.ash, true);
}
else
{
UIAlertView uvy=new UIAlertView("Notification", "Invalid
Credentials!
Please try again!", null, "OK", null); <--- this line *********
uvy.Show ();
}
}
What could be possibly wrong here? Can you spot any logical error in the
code block? Look forward to receiving some help on this matter.
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