How to call javascript function from code behind server side Asp.net C#

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[ads]Overview: Calling Javascript funtion from server side .i.e code behind in Asp.net C#.This article explains how to call a JavaScript function from server side (code behind) in Asp.net C# . First we add page and write a JavaScript function on our .aspx page, here default.aspx is our newly added  page.

Code : Add a JavaScript function on default.aspx page under head tag.

//*
<script type="text/javascript" language="javascript">
	function helloWorld(){
	   alert("welcome to startcoding.in");	
	}
</script>
//*
 

 Server side : using below given code we able to call JavaScript function from server-side.

//*
ClientScript.RegisterStartupScript(GetType(), "Javascript", "javascript:FUNCTIONNAME(); ", true);
//*
  as our JavaScriptript function name as helloWorld() so our final code would be like as given below
//*
ClientScript.RegisterStartupScript(GetType(), "Javascript", "javascript:helloWorld(); ", true);
//*
  If you have  used Asp.net UpdatePanel in your Design page (.aspx page ) then the code will be like
//*
ScriptManager.RegisterStartupScript(GetType(), "Javascript", "javascript:FUNCTIONNAME(); ", true);
//as our javascript function name as helloWorld() so we write this code as
ScriptManager.RegisterStartupScript(GetType(), "Javascript", "javascript:helloWorld(); ", true);
//*
 

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