Programmatically adding dynamically named checkboxes

Question

I am programmatically trying to add a checkbox with a unique ID to a div:

        foreach (var item in tweetList)
        {
            Panel tweetPanel = new Panel();
            tweetPanel.BorderColor = System.Drawing.Color.Black;
            tweetPanel.BorderWidth = 1;
            tweetPanel.Attributes["style"] = "padding: 20px; margin 20px; width: 20%;"; 
            tweets.Controls.Add(tweetPanel);
            CheckBox tweetChecker = new CheckBox();
            tweetChecker.ID = "checkBox" + count;
            tweetPanel.Controls.Add(tweetChecker);
            tweetPanel.Controls.Add(new LiteralControl("<img src=\"" + item.profileImageUrl + "\">"));
            count++;
        }

in this div:

    <div id="tweets" runat="server">
    </div>

But when I run it it says:

Control 'checkBox0' of type 'CheckBox' must be placed inside a form tag with runat=server.

Why wouldn't a programmatically created check box not be considered server side? And how do I fix this

wrap div with a form runat server, asp.net needs all server side controls in a form — Ehsan Sajjad
– Ehsan Sajjad, Commented Feb 26, 2016 at 20:17
The check box is considered server-side. But you're not placing it inside a server-side form. — David
– David, Commented Feb 26, 2016 at 20:20

Gilles · Accepted Answer · 2016-02-26 20:47:13Z

1

The controls need to be inside a form element so that they can be posted to the server when the form is submitted.

<form id="myForm" runat="server">
    <!-- your controls -->
    <div id="tweets" runat="server">
    </div>
</form>

You can only add controls outside of a form element if those controls do not cause a postback.

answered Feb 26, 2016 at 20:47

Gilles

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