How do I assign values to label dynamically in C# .NET

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I have few asp label controls within a form in aspx page. I am getting text values from database and now i want the label control's text to be assigned dynamically.

I am trying this:

C#

for(int i=1; i<5; i++)
 {
       Label mylabel = (Label)Page.FindControl("lblColName" + i);
      if (mylabel != null)
      {
        mylabel.Text = "Excellent!" + i;
      }
                       
 }

but getting null.

Please help me solving this.
Thank you in advance.

What I have tried:

even if i try below, i am getting null

C#

Label mylabel = (Label)Page.FindControl("lblColName");
      if (mylabel != null)
      {
        mylabel.Text = "Excellent!" ;
      }

Posted 28-Jul-19 23:59pm

Sneha Bhushan

Updated 8-May-21 9:02am

Andy Lanng

v2

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Comments

Andy Lanng 29-Jul-19 6:13am

It looks like your adding the controls dynamically. If so, can you show us the code you use to generate the labels, please.

Sneha Bhushan 29-Jul-19 6:35am

i am not adding the labels dynamically, only i want to assign the label.text dynamically

Sneha Bhushan 29-Jul-19 6:37am

<asp:label id="lblColName1" runat="server">

[no name] 29-Jul-19 6:49am

Check this: How to find control from current page when use masterpage[^]

Sneha Bhushan 29-Jul-19 7:06am

Hi, i tried it but dint work..

BillWoodruff 29-Jul-19 7:36am

See if this helps: https://stackoverflow.com/a/9830488/133321

Sneha Bhushan 30-Jul-19 1:51am

Thank you BillWoodruff, it worked for me.

RmcbainTheThird 29-Jul-19 8:12am

Can you show the markup for the label? For example on one of my aspx pages I have a label defined as <asp:label id="lblGreeting" runat="server"> and in the code behind I can assign a value thusly: lblGreeting.Text = prefName + "!";

Rajat-Indiandotnet 29-Jul-19 14:18pm

it seems the label is not directly on the page. It might be possible they reside in some other control like a panel. If this is true then check below scenario
https://stackoverflow.com/questions/20699059/how-to-find-label-controls-in-an-asp-net-page

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RezaMoghiseh · Answer 1 · 2021-05-08T09:02:00

Hi body, i found your Quiestion in Stack Overflow.
c# - Using variable in label name [^]

I see this top link.
in your code you must put in object from label. like this below. and this solution is worked for me in Window Form Application. may be worked for you in aspx page.

C#

void Button1Click(object sender, EventArgs e)
{
    var test = 1;
    var labels = Controls.Find("label" + test, true);
    if (labels.Length > 0)
    {
        var label = (Label) labels[0];
        label.Text = "Some text goes here...";

    } 
}

and that's Done . you have access on it!!! Labels[0]
your code must be like this.

C#

for(int i=1; i<5; i++)
 {

       var labels = Page.FindControl("lblColName" + i);
      

      if (labels.Length > 0)
      {
        var mylabel = (Label) labels[0];
        mylabel.Text = "Excellent!" + i;
      }
                       
 }

i hope this worked for you. please tell me the result of this !! :)) tnx man

536987524 · Answer 2 · 2019-07-31T19:37:00

For example aspx page is like

<asp:button id="AddControlButton" runat="server" text="Click Me" onclick="AddControlButton_Click">
<asp:placeholder id="placeHolder" runat="server">

C#

protected void Page_Init(object sender, EventArgs e)
{
    var label = new Label();
    label.ID = "lblTest";
    label.Text = "Label Before Click";
    placeHolder.Controls.Add(label);
}


protected void AddControlButton_Click(object sender, EventArgs e)
{
    Label label = (Label)placeHolder.FindControl("lblTest");
    label.Text = "Label After Click!";
}

How do I assign values to label dynamically in C# .NET

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