How to call code behind server method from a client side JavaScript function?

by

Yes, you can make a web method like..

[WebMethod]
public static String SetName(string name)
{
    return "Your String"
}

And then call it in JavaScript like,

PageMethods.SetName(parameterValueIfAny, onSuccessMethod,onFailMethod);

This is also required :

<asp:ScriptManager ID="ScriptMgr" runat="server" EnablePageMethods="true"></asp:ScriptManager>

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