how to implement grouping in DropDownList while bingding from database

not working

tried the given codes .its not working

First, you need to create the necessary data structure to represent the groups and items. For this example, let's assume you have a list of languages with their corresponding groups:

public class Language
{
    public string Name { get; set; }
    public string Group { get; set; }
}

Next, you can retrieve the data from the database and populate the list of languages. For demonstration purposes, I'll use a sample list:

List languagesList = new List
{
    new Language { Name = "JavaScript", Group = "first-choice" },
    new Language { Name = "PHP", Group = "first-choice" },
    new Language { Name = "Java", Group = "first-choice" },
    new Language { Name = "Golang", Group = "first-choice" },
    new Language { Name = "Python", Group = "second-choice" },
    new Language { Name = "C#", Group = "second-choice" },
    new Language { Name = "C++", Group = "second-choice" },
    new Language { Name = "Erlang", Group = "second-choice" }
};

    
    
        <% foreach (var language in languagesList.Where(l => l.Group == "first-choice")) { %>
            
        <% } %>
    
    
        <% foreach (var language in languagesList.Where(l => l.Group == "second-choice")) { %>
            
        <% } %>