Change CSS in backend

Question

When using asp.net, is it possible to modify css properties in the c# back end code in the same as Div tags? I cannot get it to work.

For example:

HTML

<div id="myDiv" runat="server" style="height:10px; color:black;" />

C#

myDiv.Style.Add("color", "white");

This works, however I am trying to do the same to a css class instead. So if I had: CSS

 .myDivStyle
    {
       height:10px;
       color:black;
    }

How can I access this and change the color in c#? The only effective way I was able to find was to have two css classes and replace the class with another one such as the answer to this: Replacing css class solution

I have tried:

myDivStyle.Style.Add("color","white");

I was wondering if it is possible to include the runat="server" property directly to the css class. Thanks in advance.

Solution 1

myDiv.Attributes.CssStyle.Add("color", "white");

This is how I do by adding CSS for the same based on the condition.

Solution 2

Apply the CSS class via attributes, like this:

myDiv.Attributes["class"] = "myDivStyle";