using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace LeftOuterJoin { class Employee { public string EmpName { get; set; } public int EmpAge { get; set; } public string EmpDeptID { get; set; } } class Department { public string DeptID { get; set; } public string DeptName { get; set; } } class Program { public static void Main(string[] args) { Employee objEmp1 = new Employee { EmpName = "Naga", EmpAge = 29, EmpDeptID = "1" }; Employee objEmp2 = new Employee { EmpName = "Sundar", EmpAge = 30, EmpDeptID = "2" }; Employee objEmp3 = new Employee { EmpName = "Siva", EmpAge = 28, EmpDeptID = "3" }; Employee objEmp4 = new Employee { EmpName = "Shankar", EmpAge = 31, EmpDeptID = "4" }; Department objDept1 = new Department { DeptID = "1", DeptName = "IT" }; Department objDept2 = new Department { DeptID = "2", DeptName = "Admin" }; Department objDept3 = new Department { DeptID = "3", DeptName = "Testing" }; Department objDept4 = new Department { DeptID = "4", DeptName = "HR" }; Department objDept5 = new Department { DeptID = "5", DeptName = "Sales" }; //Creating List of Objects List<Employee> employees = new List<Employee> { objEmp1, objEmp2, objEmp3, objEmp4 }; List<Department> depts = new List<Department> { objDept1, objDept2, objDept3, objDept4, objDept5 }; //Left Side Department Right side Employee var DeptEmpCollection = from dept in depts join emp in employees on dept.DeptID equals emp.EmpDeptID into de from Employees in de.DefaultIfEmpty() select new { dept.DeptName, EmployeesName = (Employees == null ? "--No Employee--" : Employees.EmpName) }; foreach (var EmpDept in DeptEmpCollection) { Console.WriteLine("Dept {0}, EmpName {1}", EmpDept.DeptName, EmpDept.EmployeesName); } Console.Read(); } } }
from prod in Articles join g1 in MainGroups on prod.MainGroupNo equals g1.MainGroupNo into prodGroup from kat in prodGroup.DefaultIfEmpty() select new { kat.Name, prod.ArticleNo }