gistfile1.txt

var newResult = (from client in ctx.Audit().Where(z => batches.Contains(z.BatchID) || batches.Count == 0)
                  group client by new
                  {
                      client.BatchID,
                      client.PrevBatchID,
                      client.BatchNo  ,
                      client.PrevBatchNo  ,
                  } into clientGroup
                  select new Clients
                  {
                      BatchID            = clientGroup.Key.BatchID,
                      PrevBatchID        = clientGroup.Key.PrevBatchID,
                      BatchNo            = clientGroup.Key.BatchNo,
                      PrevBatchNo        = clientGroup.Key.PrevBatchNo,                   
                      EmployeeList       = (from employee in clientGroup
                                           select new Employee 
                                           {
                                              Id = employee.ID,
                                              Name = employee.Name,
                                              Amt = employee.Amt
                                            }).ToList()
                  }).ToList();