GroupBy Multiple Values in LINQ

Here's a simple example to show you how to GroupBy Multiple Values using LINQ. In this example, I am grouping by Age and Sex to find the count of people who have the same age and sex

public partial classLINQ: System.Web.UI.Page
{
protected void Page_Load(objectsender, EventArgs e)
{
List<Employee> empList = newList<Employee>();
empList.Add(newEmployee(){ID = 1, FName = "John", Age = 23, Sex = 'M'});
empList.Add(newEmployee(){ID = 2, FName = "Mary", Age = 25, Sex = 'F' });
empList.Add(newEmployee(){ID = 3, FName = "Amber", Age = 23, Sex = 'M'});
empList.Add(newEmployee(){ID = 4, FName = "Kathy", Age = 25, Sex = 'M'});
empList.Add(newEmployee(){ID = 5, FName = "Lena", Age = 27, Sex = 'F' });
empList.Add(newEmployee(){ID = 6, FName = "Bill", Age = 28, Sex = 'M'});
empList.Add(newEmployee(){ID = 7, FName = "Celina", Age = 27, Sex = 'F' });
empList.Add(newEmployee(){ID = 8, FName = "John", Age = 28, Sex = 'M'});

var sums = empList
.GroupBy(x => new{ x.Age, x.Sex })
.Select(group => new{ Peo = group.Key, Count = group.Count() });

foreach (var employee insums)
{
    Response.Write(employee.Count + ": "+ employee.Peo);
}

}
}

classEmployee
{
public int ID { get; set; }
public stringFName { get; set; }
public int Age { get; set; }
public charSex { get; set; }
}

You can also check out similar LINQ Tutorials over here