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Is the only difference between the RegisterStartupScript and the RegisterClientScriptBlock is that RegisterStartupScript puts the javascript before the closing </form> tag of the page and RegisterClientScriptBlock puts it right after the starting <form> tag of the page? Also, when would you choose one over the other? I wrote up a quick sample page where I had an issue and I am not sure the exact reason of why it is happening. Here is the aspx markup: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="lblDisplayDate" runat="server" Text="Label" /><br /> <asp:Button ID="btnPostback" runat="server" Text="Register Startup Script" onclick="btnPostback_Click" /><br /> <asp:Button ID="btnPostBack2" runat="server" Text="Register" onclick="btnPostBack2_Click" /> </div> </form> </body> </html> Here is the Code Behind: protected void Page_Load(object sender, EventArgs e) { lblDisplayDate.Text = DateTime.Now.ToString("T"); } protected void btnPostback_Click(object sender, EventArgs e) { System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append(@"<script language='javascript'>"); sb.Append(@"var lbl = document.getElementById('lblDisplayDate');"); sb.Append(@"lbl.style.color='red';"); sb.Append(@"</script>"); if(!ClientScript.IsStartupScriptRegistered("JSScript")) { ClientScript.Register

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