ASP.net fails to RegisterClientScriptBlock

Question

When I try to register this script in my trace it says it is not registered Even though I exclaim its registration here:

Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "DrillThrough report " + (int) dr["ReportID"] + " script", vbs_script);

The scripts file name is DrillThrough6-0.Function.BT.SS2005.ReportID42193.vbs What could be going wrong. Plus if I run Internet explorer using developer tools(maybe just a coincidence, but it constantly happens only with developer tools on) it registers fine. And runs as its suppose to otherwise it doesn't run at all.

Code for Context:

SqlDataReader dr = PivotTableDB.GetReport(drillThroughReportID);
        Trace.Warn("Attempting to Read... ");
        if (dr.Read()) {
            Trace.Warn("Reading... ");
            Page.ClientScript.RegisterHiddenField("txt_DetailReportCubeName", (string) dr["CubeName"]);

            string path = (string) this.MapPath("~/DesktopModules/PivotTableNav/DrillThroughReportScripts/");
            string name = (string) dr["DisplayName_en"] + ".ReportID" + (int) dr["ReportID"] + ".vbs";
            string vbs_script = "";

            if (File.Exists(path + name)) {

                StreamReader sr = new StreamReader(path + name,System.Text.Encoding.GetEncoding("iso-8859-1"));
                vbs_script = sr.ReadToEnd();
                vbs_script = vbs_script.Replace("Spreadsheet1","document.Form1.Spreadsheet1");
                vbs_script = vbs_script.Replace("for=document.Form1.Spreadsheet1","for=Spreadsheet1");
                sr.Close();
            }

            if (vbs_script != null) {
                Trace.Warn("vbscript", vbs_script);
                Trace.Warn("vbscript-path", (path + name));
                Trace.Warn("vbscriptExist", "File exist: " + File.Exists(path + name) + " BlockRegistered already: " + Page.ClientScript.IsClientScriptBlockRegistered("DrillThrough report " + (int)dr["ReportID"] + " script"));
                if (! Page.ClientScript.IsClientScriptBlockRegistered("DrillThrough report " + (int) dr["ReportID"] + " script"))
                    Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "DrillThrough report " + (int) dr["ReportID"] + " script", vbs_script);
            }
            Trace.Warn("Was vbscript Registered: " + Page.ClientScript.IsClientScriptBlockRegistered("DrillThrough report " + (int)dr["ReportID"] + " script"));

            Title.Text = LanguageUtils.ChooseOnLanguage(dr["DisplayName_en"].ToString(), dr["DisplayName_fr"].ToString());

        }
        else { Trace.Warn("Did not read the report since no data no rows: "); }
        dr.Close();

Answer 1

To get this to work i changed RegisterClientScriptBlock to RegisterStartupScript. And now the register is successful , obivious change isClientScriptBlockRegistered to the IsStartupScriptRegistered.