Call JavaScript function from code behind in c#

Many times we come across situations where we need to call JavaScript functions from code-behind.
This can be achieved by registering ClientScript block.
Let's take a look by an example.

JavaScript function :

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<script type="text/javascript"> function WelcomeUser(username) { alert("Welcome::" + username); } </script>

Code behind :

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protected void Page_Load(object sender, EventArgs e) { ClientScript.RegisterStartupScript(GetType(), "hwa", "WelcomeUser('VJ');", true); }

This will call Welcomeuser method from code behind.