Google Search using Web Service

Tutorial that shows how to build a C# application that can search the web using Google's Web Service.

With the Google Web APIs service, software developers can query more than 4 billion web pages directly from their own computer programs. Google uses the SOAP and WSDL standards so a developer can program in his or her favorite environment – such as Java, Perl, or Visual Studio .NET.

In this tutorial we’ll make a little application that can search the web with Google. It will use of course a web service provided by Google. More information about it can be found at

Before we start you need to have an account at Google because using that account you can get the license key (don’t worry, it’s free) that will allow you to do 1000 queries per day. So register at and after you confirm using the link in the email they sent you go to and you’ll get another email from Google containing the key you need.

There’s no need to download the project but if you want, go ahead:

Now create a new Windows Application project named GoogleWS and add four TextBoxes with the followin names:

txtKey (where you’ll enter you license key, you can set the Text property to your license key now so you don’t have to enter it every time you run the application)

txtNum (where the number of results will be displayed)

txtSearch (where the string you want to search will be entered)

txtResult (set the Multiline property of this one to True and ScrollBars property to Both because this is where will display the result)

Further add a ComboBox named cmbPage with the property DropDownStyle set to DropDownList and a Button named btnSearch.

Finally add two CheckBoxes named chkFilter and chkSafeSearch.

With some labels added this is how the form looks like:

Now let’s add a WebReference to Google’s WebService. Go ahead, right click the project in Solution Explorer and select Add Web Reference. And this is the URL you need to enter, that points to Google’s WebService:

The connection is added to Solution Explorer, but let’s rename it to google:

First let’s see the code:

public void search(int start)


   // Set the mouse pointer to Busy

   this.Cursor = Cursors.WaitCursor;

   // Clear for any earlier results


   // Create new GoogleSearchService

   google.GoogleSearchService GSS = new google.GoogleSearchService();

   // Create new GoogleSearchResult

   google.GoogleSearchResult GSR = GSS.doGoogleSearch(txtKey.Text, txtSearch.Text, start, 10, chkFilter.Checked, "",    chkSafeSearch.Checked, "", "", "");

   // Store the number of total results

   int resNum = GSR.estimatedTotalResultsCount;

   // resNumX will be used for looping

   int resNumX = 0;

   // Show the number of results

   txtNum.Text = resNum.ToString();

   // Loop through all the results

   while(resNum > resNumX)


      // Add them to the combo box

      cmbPage.Items.Add(resNumX.ToString() + " - " + (resNumX+10));

      // Increment with 10 because we display 10 items / page

      resNumX = resNumX + 10;


   // Select the coresponding item

   cmbPage.SelectedIndex = (start / 10);

   // Word suggestion

   string suggested = GSS.doSpellingSuggestion(txtKey.Text, txtSearch.Text);

   // If there is a suggestion

   if(suggested != null)


      // Show it

      txtResult.AppendText("Did you mean: " + suggested + "\r\n\r\n");


   // Loop through the elements

   foreach(google.ResultElement result in GSR.resultElements)


      // Show the title

      txtResult.AppendText(result.title + "\r\n");

      // The URL

      txtResult.AppendText(result.URL + "\r\n");

      // And the summary

      txtResult.AppendText(result.summary + "\r\n");


   // Set the selection start to 0...

   txtResult.SelectionStart = 0;

   // so we can scroll to the top of the textBox


   // Set the cursor back

   this.Cursor = Cursors.Default;


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


   // Do the search starting from item 0



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


   // If the index is changed start from the item

   // equal with the selected item in the combo box

   search((cmbPage.SelectedIndex * 10));


The most important method that we used is the following:

doGoogleSearch(string key, string q, int start, int maxResults, bool filter, string restrict, bool safeSearch, string lr, string ie, string oe)

Compile it and give it a try. Don’t enter a very common keyword like programming or Microsoft because it will take longer than you think. The name geekpedia isn’t so well known , here’s the result:

Further you should download the Google Web APIs Developer Kit and check Google Web APIs Reference to add more functionality to the program.

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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