Which characters are valid in CSS class names/selectors?

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In ASP.NET, you can add a CSS class to an HTML element programmatically using C# code-behind. Assuming you are working with a web forms application, here's an example of how you can add a CSS class to a control in the code-behind file (.aspx.cs): csharp using System; using System.Web.UI; public partial...
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In ASP.NET, you can add a CSS class to an HTML element programmatically using C# code-behind. Assuming you are working with a web forms application, here's an example of how you can add a CSS class to a control in the code-behind file (.aspx.cs): csharp using System; using System.Web.UI; public partial class YourPage : Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // Assuming you have a TextBox with ID "myTextBox" in your ASP.NET markup myTextBox.CssClass = "yourNewClass"; } } } In this example, during the Page_Load event (you can choose another appropriate event based on your requirements), we access the TextBox with the ID "myTextBox" and set its CssClass property to "yourNewClass". If you are working with ASP.NET MVC, you can set the class directly in the Razor view: csharp @{ ViewBag.Title = "Your Page"; } <div> @Html.TextBoxFor(model => model.YourProperty, new { @class = "yourNewClass" }) </div> In this MVC example, the TextBoxFor helper method is used to generate the TextBox, and the new { @class = "yourNewClass" } syntax is used to set the CSS class. Make sure to replace "yourNewClass" with the actual class name you want to apply. The specific implementation may vary based on your ASP.NET project structure and version. read less
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