Deferred And Immediate Execution In LINQ

List<string> weekdays = new List<string>();
weekdays.AddRange(new string[] 
            { "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"});

var weekdayWithT = from element in weekdays where element.StartsWith("t") select element;

foreach (var el in weekdayWithT)
{
     MessageBox.Show(el.ToString());
}

List<string> weekdays = new List<string>();
weekdays.AddRange(new string[] 
{ "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"});

int weekdayWithTCount = (from element in weekdays where element.StartsWith("t") select element).Count();
MessageBox.Show(weekdayWithTCount.ToString());

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