Hello Muhammad Saqib,
We do not have documentation on how to do this.
I can suggest that you take a look at Facebook's developer documentation. First you need to get an API key for your website: Create an Application
. You can use HtmlGenericControl to create the tag and add it to the page:
protected void Page_Load()
HtmlGenericControl likeButton = new HtmlGenericControl("fb:like");
Note that you should add the java script code which loads their SDK.
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