Execute javacript from code behind

Hi!

I have an asp.net page that is called from an externat system (credit card company). When the asp.net file is requested I need to make a JavaScript Call from the asp.net code behind file. The problem is that the JavaScript never runs.

Asp.net code front:

<asp:PlaceHolder runat="server" ID="plhAnalytics" />

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Asp.net code behind:

protected void Page_Load(object sender, EventArgs e)
{
  if ([A LOT OF STUFF])
  {
    TrackAnalytics();
  }
}

protected void TrackAnalytics()
{
    PlaceHolder plhAnalytics = this.plhAnalytics;
    HtmlGenericControl objScript = new HtmlGenericControl("script");
    objScript.Attributes.Add("type", "text/javascript");

    System.Text.StringBuilder strScript = new System.Text.StringBuilder();
    strScript.Append("analytics.identify('1234567890', {\n");
    strScript.Append("plan: 'Paid'\n");
    strScript.Append("});\n");
    strScript.Append("analytics.track('Payment Created', {\n");
    strScript.Append("category: '" + type + "'\n");
    strScript.Append("});\n");

    objScript.InnerHtml = strScript.ToString();
    plhAnalytics.Controls.Add(objScript);
}

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How can I Call this JavaScript for code behind?