Question

I want to split List of user generic List into its small list with each 5 records.

Ex

I have List: u1,u2,u3,u4,u5,u6,u7,u8,u9,u10,u11,u12,u13,u14,u15.
so must be split into 
List1:u1,u2,u3,u4,u5
List2:u6,u7,u8,u9,u10
List3:u11,u12,u13,u14,u15

Any direct method available or need programing logic in c# ?

Answer 1

You can group on the index:

List<List<User>> lists =
  list
  .Select((u, i) => new { List = i / 5, User = u })
  .GroupBy(g => g.List, g => g.User)
  .Select(g => g.ToList())
  .ToList();

You can also use Range to make a loop and get a part of the list for each iteration:

List<List<User>> lists =
  Enumerable.Range(0, (list.Count + 4) / 5)
  .Select(n => list.Skip(n * 5).Take(5).ToList())
  .ToList();