something wrong with my asp button while adding it to a panel.. ASP & C#

Question

I'm creating a button and adding it to a panel

        Panel p = new Panel();
        p.ID = "b_con";
        p.Attributes.Add("runat", "server");
        this.Controls.Add(p);
        Button b = new Button();
        b.Attributes.Add("value", "reply");
        b.Attributes.Add("id", Convert.ToInt32(r["Message_ID"]).ToString());
        b.Attributes.Add("class", "button");
        b.Click += new System.EventHandler(button_Click);
        p.Controls.Add(b);

I got this error Control 'ctl01' of type 'Button' must be placed inside a form tag with runat=server.

Panels are server controls. You don't need to add runat="server". A Button has an Id and a Text property. — Tim Schmelter
– Tim Schmelter, Commented Oct 4, 2012 at 20:18

Lawrence Johnson · Accepted Answer · 2012-10-04 20:48:56Z

3

The page you are adding it to needs to have this on it. And your panel must live within the form tags.

<body>
<form runat="server">

<!-- Panel must be added within here -->
<div id="messages_con">
    <asp:Panel id="b_con" runat="server" />
</div>

</form>
</body>

So the panel you add it to needs to be in your Html Code. You are adding a button to a panel that doesn't exist on the page. Instead, reference the panel in the Html (as seen above), like this:

Panel p = b_con;
//p.ID = "b_con";
//p.Attributes.Add("runat", "server"); -- Not necessary
this.Controls.Add(p);
Button b = new Button();
b.Attributes.Add("value", "reply");
b.Attributes.Add("id", Convert.ToInt32(r["Message_ID"]).ToString());
b.Attributes.Add("class", "button");
b.Click += new System.EventHandler(button_Click);
p.Controls.Add(b);

edited Oct 4, 2012 at 20:48

answered Oct 4, 2012 at 20:18

Lawrence Johnson

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8 Comments

Fady Over a year ago

The problem is that I'm creating the whole thing in the behind code .. how can I make the runat server form within the behind code?

Lawrence Johnson Over a year ago

Are you saying you don't have a Web page that you are putting this on?

Fady Over a year ago

I have a web page but all of its contents coming from the behind code, because the panels & the buttons are depending on database results. I can change the way that I'm using to do this, but I a newbie to ASP and obviously I don't know how .. :

Lawrence Johnson Over a year ago

What do you mean by ALL of its contents? You do have a <body> tag, yes?

Fady Over a year ago

I have a body tag .. and I have in it <div id="messages_con"></div> and I change the div contents from my behind code using InnerHtml

|

Prashant Mehta · Accepted Answer · 2012-10-05 06:48:40Z

0

Use Form.Controls.Add(p);

by using this we can add panel on form tag.

answered Oct 5, 2012 at 6:48

Prashant Mehta

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