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Editorial Team
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Asked: 2026-06-01T14:02:29+00:00

I have the following code : <html xmlns=http://www.w3.org/1999/xhtml> <body style=height: 1336px> <input type=hidden id=loadingtime/>

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I have the following code : 

<html xmlns="http://www.w3.org/1999/xhtml">

<body style="height: 1336px">
<input type="hidden" id="loadingtime"/>
.
.
.
.
</body>
</html>

and the Code.cs file is : 

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Diagnostics;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string s = "";
        HiddenField t = (HiddenField)Page.FindControl("loadingtime");
        s = t.Value;
        Response.Write("<script language='javascript'>alert('It took : " + s + "')</script>");
    }
}

I get error
Any idea?

EDIT :
The above problem is successfully solved by
Now when I retrieve the value of loading time, the value is empty string. Can anyone please solve this one?
enter image description here

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1 Answer

  1. Editorial Team

    Your input should have runat=”server” enabling it to be parsed by the ASP.NET runtime i.e.

    <input type="hidden" runat="server" id="loadingtime"/>

    You can then refer to the control as you would normally in code behind using:

    HiddenField t = (HiddenField)loadingtime;

    AS LONG AS it is not wrapped in another server control such as an asp:repeater in which case you would need to use alternative method of traversing the control hierarchy

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