Control.Attributes.Add doesn't work for check box

Question

I have created dynamic checkbox with ID="chk" and I want to apply inline style to it. I tried

chk.Attributes.Add("style","opacity:1");

But it doesn't work as expected. It created span around check box and applies style to that. But it works

chk.InputAttributes["style"] = "opacity:1";

But former works fine for TextBox . Why this complexity for different controls?

Update

As un-lucky answered , it is just an alternative that buries my real question ie Why this complexity for different controls? . Lets forget about style , think of any other atrribute. Why check box is different when it comes to Attribute.Add ?

Answer 1

To add styles you have to try Style property instead for Attributes Following code will help you:

chkBox.Style.Add("opacity", ".3");

You can also try like this:

chkBox.Style["width"] = "70px";
chkBox.Style["height"] = "70px";

Answer 2

ASP.Net renders two <input> elements for checkboxes to overcome the fact that an unchecked checkbox is not POST ed.

I guess the easier approach is to assign CSS classes in code, and adjust your CSS to deal with the HTML details.