linq grouping (groupby subset enumeration)

 
var grpOrderedFirstLetter = empList.GroupBy(employees =>
    new String(employees.FName[0], 1)).OrderBy(employees =>
    employees.Key.ToString());;

foreach (var employee in grpOrderedFirstLetter)
{
    Console.WriteLine("\n'Employees having First Letter {0}':",
                      employee.Key.ToString());
    foreach (var empl in employee)
    {
        Console.WriteLine(empl.FName);
    }
}