How do you programmatically apply a css class to an asp.net control?

Question

I\'m wondering how I can apply a CSS class to an ASP.NET Control (TextBox in this case) through the backend in C#. For example:

Answer 1

if(yourCondition) {
    var css = "myClass";
    if(String.IsNullOrWhiteSpace(element.CssClass))
        element.CssClass = css;
    else
        element.CssClass += " " + css;
}

Answer 2

you can use attribute of ui controls

firstName.Attributes["css"]="Your Class Name";

Answer 3

You can implement adding cssClass like

firstName.CssClass = "input left selected";

Or

make onClick event for textbox

<asp:TextBox ID="firstName" CssClass="input left" runat="server" Text="First Name" OnClick="firstName_Click"  />

Then in code-behind:

void firstName_Click(Object sender, EventArgs e) {
    MyTextBox.CssClass = "input left selected";
}

Answer 4

You can just do this:

 firstName.CssClass = "input left selected".

If you want to append to any existing class names, do this:

firstName.CssClass += " selected";

Answer 5

It's just a string property of WebControl:

firstName.CssClass += " selected";

Answer 6

I think you could do that in the normal way something like below:

      if (value.Equals(true))
       {
            firstName.CSSClass = "input left selected";
       }

Hope this helps!!