How to open pdf at particular section in new tab/window from code behind in C#

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C#

PDF

Hi all, I am working on a web application, in which I have a help icon on some screen. All i need to do is when user click on a help icon, a pdf file of help document will open in new tab/window and this pdf should open at a particular section (i.e. should not open from page 1). Please help me out to achieve this.
Here is my code:

protected void registrationHelpIcon_ServerClick(object sender, EventArgs e)
{
    try
    {
        string appBaseUrl = Request.Url.Scheme + "://" + Request.Url.Authority + Request.ApplicationPath.TrimEnd('/') + "/";
        string pdfPath = "Temp/xtLytics_security_module.pdf";
        WebClient client = new WebClient();
        Byte[] buffer = client.DownloadData(appBaseUrl + pdfPath);
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-length", buffer.Length.ToString());
        Response.BinaryWrite(buffer);
    }
    catch(Exception ex)
    {
        Logger.Log(LogLevel.SystemError, ex);
    }
}

What I have tried:

I have tried many things from code project but unable to achieve the goal. Please help me out to get this pdf in new tab or window opened at particular section.