var filteredData = data.Where(item => item.Age > 25);
var result = from employee in employees
join department in departments on employee.DepartmentId equals department.Id
select new { employee.Name, department.DepartmentName };
var projectedData = data.Select(item => new { item.Name, item.Age });
var sortedData = data.OrderBy(item => item.LastName);
var groupedData = data.GroupBy(item => item.Department);
var convertedData = data.Cast<string>();
var concatenatedData = data1.Concat(data2);
var sum = data.Sum(item => item.Amount);
var anyAdults = data.Any(item => item.Age >= 18);
var partitionedData = data.Skip(3).Take(5);
var numbers = Enumerable.Range(1, 10);
var unionResult = data1.Union(data2);
var areEqual = data1.SequenceEqual(data2);
var firstItem = data.First();