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find a specific word in a website using asp.net C#

How can I find a specific word in a website using asp.net C#. example, if I in browse cnn.com website and I want to browse a word such as sport in the website, how can i find it using the asp.net C#.

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You can get the webpage as a string with this code

string webpageData;
using (System.Net.WebClient webClient = new System.Net.WebClient())
    webpageData = webClient.DownloadString("http://www.cnn.com");

Then just use regular string methods

var containsWord = webpageData.Contains("word");

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