How to implement searching for selected text in asp.net like the one google, bing has

If you have implemented the Context (Right click menu) options in your website. You can use the Selection of the Web API methods to get the selected text from the window.

https://developer.mozilla.org/en-US/docs/Web/API/Selection[^]

Then you can handle the click event on the menu item using jQuery or JavaScript and create a request to the Google servers alongwith the text from websites, like this

$('#menuItem').click(function () {
   // selectedText is the variable holding value from Selection
   window.open('http://www.google.com/search?q=' + selectedText);
});

For more on Window.Open read this document by MDN, https://developer.mozilla.org/en-US/docs/Web/API/Window.open[^]

Removing ambiguity

Ok, that case is really simple. Since you've already got the context, I am not going to rewrite the jQuery thing again. What you can do, is create a new page and name it "getResults.cshtml" (or the relative ASP.NET page format for your application, cshtml is a Web Pages page).

Once done, write this code to it,

var wordToSearch = Request["word"];

//initialize the Database connection
// search for the relative content in it, 

// return the results (this will be passed down to the client)

How to pass the word to it? You can use the following jQuery code to pass the word to the next page, instead of Google server.

$('#contextMenu').click(function () {
   $.ajax({
     url: '/getResults',
     // selectedWord as explained in the above code
     data: {word: selectedWord},
     success: function(data) {
       // there was a successfull request, and data was returned
       alert('Response from the server was: ' + data);
     }
   });
});

This is the code, to send the data to the server, and get the response. All using an ajax request. If you need the code to search for the contents inside the Database, read this article of mine,

How to search for related query inside the Database using ASP.NET[^]