Program:

The source code to sort a list of employees based on salary and whose department is ABC using Linq is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

//C# program to sort the list of employees based on 
//salary whose department is ABC.

using System;
using System.Linq;
using System.Collections.Generic;

public class Employee
{
    int ID;
    string Name;
    int Salary;
    string Department;

    public override string ToString()
    {
        return ID + " " + Name+" "+Salary + " "+Department;
    }

    static void Main(string[] args)
    {
        List<Employee> employees = new List<Employee>()
        {
             new Employee {ID=101,   Name="Amit  "    , Salary=4000,Department="ABC"},
             new Employee {ID=102,   Name="Gautam"    , Salary=6000,Department="XYZ"},
             new Employee {ID=103,   Name="Salman"    , Salary=3000,Department="ABC"},
             new Employee {ID=104,   Name="Ram   "    , Salary=2000,Department="XYZ"},
             new Employee {ID=105,   Name="Shyam "    , Salary=7000,Department="ABC"},
             new Employee {ID=106,   Name="Kishor"    , Salary=5000,Department="XYZ"},
        };


        var result = employees.Where(emp=>emp.Department=="ABC").OrderBy(sal => sal.Salary);


        Console.WriteLine("ID  Name  Salary  Department");
        Console.WriteLine("============================");
        foreach (Employee emp in result)
        {
            Console.WriteLine(emp.ToString());
        }
        Console.WriteLine("============================");
    }
}

Output:

ID  Name  Salary  Department
============================
103 Salman 3000 ABC
101 Amit   4000 ABC
105 Shyam  7000 ABC
============================
Press any key to continue . . .

Explanation:

In the above program, we created a class Demo that contains the Main() method. In the Main() method we created a list of employees with fields ID, Name, Salary, and Department.

var result = employees.Where(emp=>emp.Department=="ABC").OrderBy(sal => sal.Salary);

In the above code, we sorted a list of employees based on salary using OrderBy() and checked the department using Where() method.

Console.WriteLine("ID  Name  Salary  Department");
Console.WriteLine("============================");
foreach (Employee emp in result)
{
    Console.WriteLine(emp.ToString());
}
Console.WriteLine("============================");

In the above code, we accessed the employee detail one by one and print on the console screen.