Using a Geo IP Web Service

Using a Geo IP Web Service
Using an web service to determine the originating country for an IP address.

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After the tutorial on how to use the Google Search Web Service I’ve got a tutorial on using Web Services which is even simpler.

This time we’ll use a Web Service that enables you to look up the originating country for an IP address.

Information about the sevice is available here.

And the WSDL Schema Location is here.

Now open Microsoft Visual C# .NET and start a new Windows Application project named GeoIP.

Add two textboxes named txtIP and txtCountry and a button named btnCheck.

Here’s the design of the form (I also added two labels):

Now let’s add a Web Reference to the web service. So right click the project in the Solution Explorer window and choose Add Web Reference.

The following URL is the one that leads to the web service: – so this is what we’ll enter on the Address text box. Press enter to verify the reference and then click Add Reference. After the reference is added, give it a friendlier name: geoip:

Now we code. Unfortunately we don’t have much to code 🙂

public void checkIP(string ip)


   // Change cursor to WaitCursor

   this.Cursor = Cursors.WaitCursor;

   // Create new GeoIPService

   geoip.GeoIPService IPServ = new geoip.GeoIPService();

   // Use GetGeoIP method to check the IP

   geoip.GeoIP IPRes = IPServ.GetGeoIP(ip);

   // If ReturnCode is 1, IP was found

   if(IPRes.ReturnCode == 1)


      // Change BackColor to normal

      txtCountry.BackColor = Color.White;

      // Display the name of the country

      txtCountry.Text = IPRes.CountryName.ToString();


   // If IP wasn't found



      // Give a red tint to the TextBox

      txtCountry.BackColor = Color.FromArgb(255, 235, 235);

      // And tell the user it wasn't found

      txtCountry.Text = "IP not found";


   // Cursor back to default

   this.Cursor = Cursors.Default;


private void btnCheck_Click(object sender, System.EventArgs e)


   // Call checkIP to check the IP in the TextBox



Go ahead, try it:

Go ahead, try it:That wasn’t so hard 🙂

Nathan Pakovskie is an esteemed senior developer and educator in the tech community, best known for his contributions to With a passion for coding and a knack for simplifying complex tech concepts, Nathan has authored several popular tutorials on C# programming, ranging from basic operations to advanced coding techniques. His articles, often characterized by clarity and precision, serve as invaluable resources for both novice and experienced programmers. Beyond his technical expertise, Nathan is an advocate for continuous learning and enjoys exploring emerging technologies in AI and software development. When he’s not coding or writing, Nathan engages in mentoring upcoming developers, emphasizing the importance of both technical skills and creative problem-solving in the ever-evolving world of technology. Specialties: C# Programming, Technical Writing, Software Development, AI Technologies, Educational Outreach

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