Code sample written for a StackOverflow question to show how to build alpha link roulette html by extracting and grouping the first letters of a list of jobs.

GetAlphaRouletteLinksHtmlMarkup.cs

public class GetAlphaRouletteLinks
{
    // Outputs markup like this:
    // <a href="#rouletteA">A</a> | <a href="#rouletteB">B</a> | <a href="#rouletteC">C</a> | <a href="#rouletteD">D</a> | <a href="#rouletteE">E</a> | <a href="#rouletteF">F</a> | G | <a href="#rouletteH">H</a> | <a href="#rouletteI">I</a> | <a href="#rouletteJ">J</a> | K | <a href="#rouletteL">L</a> | <a href="#rouletteM">M</a> | <a href="#rouletteN">N</a> | <a href="#rouletteO">O</a> | <a href="#rouletteP">P</a> | <a href="#rouletteQ">Q</a> | <a href="#rouletteR">R</a> | <a href="#rouletteS">S</a> | <a href="#rouletteT">T</a> | <a href="#rouletteU">U</a> | V | <a href="#rouletteW">W</a> | X | Y | Z
    // Notice how it skips the link for any letters that don't have jobs starting with that letter eg:
    // <a href="#rouletteW">W</a> | X | Y | Z
    
    public string GetAlphaRouletteLinksHtmlMarkup()
    {
        var JobList = new List<String>() {
            "AccessibleEmployment",
            "accessIndiana",
            "AccountingNet",
            "Alldiversity.com",
            "American Chemical Society",
            "America's Job Bank",
            "Art Careers",
            "Asian MBA",
            "Back Door Jobs",
            "Career Search",
            "Careerbliss",
            "Careerbuilder",
            "CareerJet",
            "CareerMagazine",
            "CareerMosaic",
            "CareerOverview",
            "Careers 2005",
            "City of Evansville jobs",
            "College Recruiter",
            "CollegeGrad.com",
            "ComputerJobs",
            "Conservation Job Board",
            "Cuyahoga County Public Library",
            "Dentist Jobs Help",
            "EMPLOYMENTCROSSING",
            "Evansville Courier & Press Classifieds",
            "Exam2Jobs",
            "Experience.com",
            "Federal Government Jobs",
            "Flipdog",
            "FPSelectJobs",
            "hotjobs",
            "Hound",
            "Idealist",
            "Indeed",
            "Indiana Health Careers",
            "Indiana Job Central",
            "Indiana Youth Institute",
            "IndianaCAREERConnect",
            "Inside Jobs",
            "Internships",
            "Jackson County Industrial Development Corporation",
            "Jamminjobs",
            "Job Application Center",
            "Job Search USA",
            "Job Seeker's Bookmarks",
            "Job-Applications",
            "JobCo",
            "Jobs in Indianapolis Web site",
            "JobScribble",
            "Journal of Young Investors",
            "Learn More Indiana",
            "Louisville, KY jobs",
            "Mediapost",
            "NBMBAA",
            "News-Line Communications",
            "On-Line Career Center",
            "Online Recruiters Directory",
            "PeaceCorps",
            "Quintessential Careers",
            "Riley Guide",
            "RiseSmart",
            "SallieMae True Careers",
            "ScienceJobs.com",
            "Simply Hired",
            "SmartBrief",
            "Snagajob.com",
            "State government job opportunities",
            "Student Employment Opportunities",
            "Teacher Jobs Help",
            "The Ladders Career Advice",
            "U. S. Department of State",
            "USAJOBS",
            "wetfeet",
            "WomensJobSearch",
            "Work In Sports",
            "WorkplaceDiversity"
        };

        var letters = from alpha in "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z".Split(',')
                      let firstLetters = (from job in JobList
                                          orderby job
                                          group job by job[0].ToString().ToUpper() into firstLetters
                                          select firstLetters.Key)
                      select new
                      {
                          Letter = alpha,
                          IsLink = firstLetters.Contains(alpha)
                      };
                              
        StringBuilder outputHtml = new StringBuilder();
        foreach (var item in letters)
        {
            if (item.IsLink)
            {
                // add html
                outputHtml.AppendFormat("<a href=\"#roulette{0}\">{1}</a> | ", item.Letter, item.Letter);
            }
            else
            {
                // no html
                outputHtml.Append(item.Letter);
                outputHtml.Append(" | ");
            }
        }

        return outputHtml.ToString().TrimEnd(" | ".ToCharArray());
    
    }
}