Label not displaying the text in asp.net, visual studio 2010

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Well, I have one software(Authoring tool), it has some functionality by which I can fetch values from it in my C# application. So I am trying to fetch a value for TestName. After it I want to display that fetched value in a label, say Label1. I run the code but it is not showing the fetched value "Test 1", instead it just show me "Label1". So for testing when I debug the code using F10 in Visual studio 2010, I saw that in first loop it fetches the correct value that is "Test 1" and in Label also it shows correct value, "Test 1". But then don't know why after completing, it again goes to the first line of code and again whole loop executes. At that time it shows null values and thus at run, it doesnt show me desired value just showing "Label1". I am writing the code in Page_Load of .aspx.cs and my label is in .aspx of the same page. Help. Code is here.
Code is here.
test.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Collections;

public partial class test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{    //get the parameters posted from the test
    if (Page.IsPostBack)
    { }
    else
    {
        string testname = Request.Form["TestName"];
        Label1.Text = testname;
    }
}
}

test.aspx :

<%@ Page Language="C#" debug="true" AutoEventWireup="true" CodeFile="test.aspx.cs"   

Inherits="test" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"   

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>

<body>
<%--<script type="text/javascript" language="Javascript">
 function setValues()
{
  //first check if you get TestName value byusing alert
   alert(document.getElementById("TestName").value);
   document.getElementById("Label1").innerHTML =    

document.getElementById("TestName").value;
//give return false to avoid postback
return false;
}
</script>--%>


<form id="form1" runat="server">
<div>

</div>

<p>

   <asp:Label ID="Label1" runat="server" Text="Label" Font-Size="Larger"></asp:Label>

</p>

</form>
</body>
</html>

Posted 14-Oct-13 23:51pm

JL_Coder

Updated 15-Oct-13 0:09am

v2

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Comments

[no name] 15-Oct-13 5:59am

Ctrl + V whole code

JL_Coder 15-Oct-13 6:56am

OK. I added whole the code. Kindly see it. I also tried isPostback property, it didn't work. I also tried javascript which you can see in code in comments.

Ankur^\m/ 15-Oct-13 6:06am

We will need to see "the loop code" you are talking about.

JL_Coder 15-Oct-13 6:57am

OK. I added whole the code. Kindly see it. I also tried isPostback property, it didn't work. I also tried javascript which you can see in code in comments.

Ankur^\m/ 15-Oct-13 7:29am

Use 'Reply' button to reply to a comment. Please do not post same comment again and again.
I don't see 'TestName' in your HTML. What is it and how do you fill it's value. Otherwise the code seems fine to me and the label value should retain.

JL_Coder 15-Oct-13 7:36am

As I mentioned, it is 'TestName' is what I am fetching from another software outside VS10. It is possible by some functionality of that software and I am getting it while debugging. But not after completion of the first time loop.

Ankur^\m/ 15-Oct-13 7:55am

If you are fetching the value using a third party tool, it must be done on the server side, unless they have some api which you can call from your javascript code.
Okay, this line of code - Request.Form["TestName"];
It means there is some control with id 'TestName' on your form. You are basically getting its value here. So are you fetching the value from third party tool at the client side and store it in some html control named TestName?

JL_Coder 15-Oct-13 8:05am

Yes, third party tool I am using has some functionality by which I am getting the value of TestName from it in c# page while debugging I see TestName changes as "Test 1" which I want, but when displaying that value "Test 1" in a label, it doesn;t show "Test 1" but "Label1" because it again makes one loop to Request.Form[] and at second loop it shows null value.

Ankur^\m/ 15-Oct-13 8:08am

You say you are fetching the value in C# page, so I am considering you are fetching the value on server side. Get the value in a variable and assign it to Label text. Why do you need Request.Form["TestName"] ?

JL_Coder 16-Oct-13 2:02am

Did it. same problem. See, I did debug using F10. Line by line. At first, it shows me value "Test 1" when I fetch it from third party tool. Then it even shows me the fetched value "Test 1" in label. But then, don't know how, instead of ending the loop, it again goes to the first line where I am fetching the code from third party tool, and then it shows null value, thus in label also it shows null value and thus, I am not getting the value "Test 1" in Label.

Ankur^\m/ 16-Oct-13 5:48am

You mean your page load event is called twice?

JL_Coder 16-Oct-13 6:03am

yes

Ankur^\m/ 16-Oct-13 7:57am

Is it also happening even the first time the page is loaded? If yes, you may have some control which is doing a post back on document load.
I would remove the third party code, hard code the value of testname and then test. If the page load is called twice now, there is some problem in the page otherwise there could be something wrong in how you are using the 3rd party tool.
I would also go through - https://www.google.com/#q=page+load+called+twice+asp.net

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kasheer · Answer 1 · 2014-03-17T04:40:00

Solution 3

C#

You must be setting that label some where else false
. That is why its not showing.

I'd same problem. than I solved it this way.
Hope this helps your too

Posted 17-Mar-14 4:40am

kasheer

chandrayog.2 · Answer 2 · 2013-10-15T00:00:00

Solution 1

hi,

After page load event, check page is post or not. write your code inside in it:

C#

protected void Page_Load(object sender, EventArgs e)
      {
          if (!Page.IsPostBack)
          {

}

Posted 15-Oct-13 0:00am

chandrayog.2

Comments

Ankur^\m/ 15-Oct-13 6:07am

And how will this correct the issue?

Salman622 15-Oct-13 9:13am

when the page is post back it lost all its data
and the requirement of R_Coder is label text which is lost because of post back
if he write his code in !ispostback block the label text will not lost
and it will only load once after that it will not enter that block
here this is the solution........

Ankur^\m/ 15-Oct-13 9:25am

Firstly, a Label control will not loose its text property when the page is post back (unless you have disabled the ViewState for the page/control).
And you have got the question wrong. He never said the value is lost on postback. The value is never really shown, be it first load or a postback. There is some kind of loop where he is losing the value.

JL_Coder 16-Oct-13 2:03am

@Salman622- I did it also. But it goes again to if block. I checked the label properties, they seem good.

JL_Coder 15-Oct-13 6:11am

OK. I added whole the code. Kindly see it. I also tried isPostback property, it didn't work. I also tried javascript which you can see in code in comments.

Salman622 · Answer 3 · 2013-10-15T00:00:00

Solution 2

write your code in page load as below

C#

protected void Page_Load(object sender, EventArgs e)
   {

if(!Ispostback)
{
//your code;
}
}

Posted 15-Oct-13 0:00am

Salman622

Comments

Ankur^\m/ 15-Oct-13 6:07am

And how will this correct the issue?

JL_Coder 15-Oct-13 6:11am

OK. I added whole the code. Kindly see it. I also tried isPostback property, it didn't work. I also tried javascript which you can see in code in comments.

Salman622 15-Oct-13 9:15am

write your code in if block not in else part

Salman622 15-Oct-13 9:15am

write your code in if block not in else part