Add javascript from code behind page c#

Hello ,
  How do I include some js code in mt ascx page?

In my ascx page I have a tag
<asp:Literal ID="ltrlTop" runat="server"></asp:Literal>

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In my code behind (ascs,cs) file

 private string generatePreScript()
            StringBuilder sb = new StringBuilder();
            sb.Append("<script type='text/javascript'>");
            sb.Append("dataLayer.push({'event': 'pageview', 'pageview':'/vp/apply.html'}); ");
            return sb.ToString();

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I want set the ltrlTop  to the js value

tried  ltrlTop.Text = generateSuccesScript(); but I get dataLayer is undefine

Thanks for your help
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käµfm³d 👽Commented:
Have you looked at ScriptManager.RegisterClientScriptBlock yet?
Kyle AbrahamsSenior .Net DeveloperCommented:
Just put this line of code where you want it to be called.  After the page is rendered the JS will fire.  

ScriptManager.RegisterStartupScript (this, this.GetType(), "MyTopCodeBlock", "dataLayer.push({'event': 'pageview', 'pageview':'/vp/apply.html'}); ", true);

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SiemensSENAuthor Commented:
Thanks .. so I don't need to add <asp:Literal ID="ltrlTop" runat="server"></asp:Literal> to my ascx page?
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Kyle AbrahamsSenior .Net DeveloperCommented:
nope.  The registerStartupScript will inject (and fire) the javascript code.
SiemensSENAuthor Commented:
Thanks,  but i still get the error  dataLayer is undefined
Kyle AbrahamsSenior .Net DeveloperCommented:
that's a javascript error.  where is your dataLayer var declared?
SiemensSENAuthor Commented:
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