How do i change the visibilty and size of css object with c#

Question

I have a div with id _box1

My on click event accesses the c# routine below:

private void Expand_Ratings(object src, EventArgs e)
    {

        _box1.Style["background-color"] = "Red";

    }

when I run the compiler I get:

Compiler Error Message: CS0103: The name '_box1' does not exist in the current context

Can anyone please assist

Answer 1

You need to add runat="server" attribute to the tag in HTML code tobe accessible from server side code.

Try This:

<DIV ID="_box1" runat="server">

</DIV>

Answer 2

You should add runat="server" to your div.

And then you should do this:

_box1.Attrbutes["style"] = "background-color:red";

Answer 3

Yes at runat server in the div.

<div ID="_box1" runat="server">

</div>

In the code behind..

_box1.Width = 300;
_box1.Height = 300;
_box1.Visible = false;

or by CSS
_box1.Style["Height"] = "300px";
_box1.Style["Visible"] = "false";

Good luke