Calling JavaScript Function From CodeBehind
You may try this :
Page.ClientScript.RegisterStartupScript(this.GetType(),"CallMyFunction","MyFunction()",true);
C# to JavaScript: you can register script block to run on page like following:
ClientScript.RegisterStartupScript(GetType(),"hwa","alert('Hello World');",true);replace alert() part with your function name.
For calling C# method from JavaScript you can use ScriptManager or jQuery. I personally use jQuery. You need to decorate the method that you want to call from JavaScript with WebMethod attribute. For more information regarding calling C# method (called PageMethod) from jQuery you can refer to Dave Ward's post.
Calling a JavaScript function from code behind
Step 1 Add your Javascript code
<script type="text/javascript" language="javascript"> function Func() { alert("hello!") }</script>Step 2 Add 1 Script Manager in your webForm and Add 1 button too
Step 3 Add this code in your button click event
ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "text", "Func()", true);