Simple example of Linq GroupBy in C# using method syntax

LinqGroupByMethodSyntax.cs

var customers = new List<(string Name, string Town)>
{
    ("Isaac", "London"),
    ("Sara", "Birmingham"),
    ("Tim", "London"),
    ("Michelle", "Manchester")
};

var customersByTownQuery = customers
    .GroupBy(c => c.Town)
    .OrderBy(g => g.Key)
    .Select(g => g);

foreach (var group in customersByTownQuery)
{
    Console.WriteLine(group.Key);
    foreach (var customer in group)
    {
        Console.WriteLine($"\t{customer.Name}");
    }
}