Call a web service from a Windows Application

Question

I am new to .NET and C#. I created a Web service, and I am able to view it from a Web page. When I try to call it from a Windows Application, I get the Exception 401 : unauthorized. Code compiles OK, but throws exception when running. This is the code from the Windows App. :

namespace BookStore
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Create a new instance of a service
            localhost.Service1 datasvc = new localhost.Service1();

            // Create instance of dataset, using WebService method GetTitleAuthors.
            DataSet myData = datasvc.GetTitleAuthors();

            // Set DataGrid's datasource to the myData DataSet.
            dataGridView1.DataSource = myData;

            //Expand all rows.            
            //dataGridView1.Expand(-1);

            //Expand DataTable
            //dataGridView1.NavigateTo(0, "Authors"); 
        }
    }
}

PS : I am using Windows Authentication in the website that hosts the web service.

Answer 1

I believe there is a property on the generated proxy to the effect of UseDefaultCredentials try setting that to true.

datasvc.UseDefaultCredentials = true;

Although it's been a while I think this will force the service to pass windows credentials.

Answer 2

I don't know what type your Service1 object inherits so I can't say what properties or methods you have associated with it, but whenever I know you can make calls to you web service with using

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(URL);

And then either using

req.UseDefaultCredentials = true;

or

req.Credentials = new NetworkCredential(userName, password);