C# Program to Print the Employees Whose ID is Greater Than 101 Using LINQ

LINQ is known as Language Integrated Query and it is introduced in .NET 3.5. It gives the ability to .NET languages to generate queries to retrieve data from the data source. It removes the mismatch between programming languages and databases and the syntax used to create a query is the same no matter which type of data source is used. In this article, we will display the employee details whose ID greater than 101 using LINQ.

Example:

Input:
List of employees:
      {{emp_id = 101, emp_name = "bobby",  emp_age = 12},
       {emp_id = 102, emp_name = "deepu",  emp_age = 15},
       {emp_id = 103, emp_name = "manoja", emp_age = 13},
       {emp_id = 104, emp_name = "saroja", emp_age = 14},
       {emp_id = 105, emp_name = "sravan", emp_age = 15},
       {emp_id = 106, emp_name = "navya",  emp_age = 12},
       {emp_id = 107, emp_name = "majnu",  emp_age = 12},
       {emp_id = 108, emp_name = "vishnu", emp_age = 12}}
Output:
      {{emp_id = 102, emp_name = "deepu",  emp_age = 15},
       {emp_id = 103, emp_name = "manoja", emp_age = 13},
       {emp_id = 104, emp_name = "saroja", emp_age = 14},
       {emp_id = 105, emp_name = "sravan", emp_age = 15},
       {emp_id = 106, emp_name = "navya",  emp_age = 12},
       {emp_id = 107, emp_name = "majnu",  emp_age = 12},
       {emp_id = 108, emp_name = "vishnu", emp_age = 12}}
      
Input:
List of employees:
      {{emp_id = 101, emp_name = "bobby",  emp_age = 12},
       {emp_id = 102, emp_name = "deepu",  emp_age = 15},
       {emp_id = 103, emp_name = "manoja", emp_age = 13}}
Output:
      {{emp_id = 102, emp_name = "deepu",  emp_age = 15},
       {emp_id = 103, emp_name = "manoja", emp_age = 13}}

Approach:

To display the employee details whose ID greater than 101 follow the following approach:

1. Create a list of employees with three variables (Id, name and age)
2. Iterate through the employee details by using where function and get the employee details by choosing employee id greater than 101
3. Select the details which are greater than 101
4. Call the ToString() method
5. Display the employee details

Example:

C#

// C# program to display the details of the employee
// whose ID greater than 101
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Employee{

// Declare 3 variables - id,age and name
int emp_id;
int emp_age;
string emp_name;

// Get the to string method that returns
// id , name and age
public override string ToString()
{
    return emp_id + " " + emp_name + " " + emp_age;
}

// Driver code
static void Main(string[] args)
{

    // Declare a list variable
    List<Employee> emp1 = new List<Employee>()
    {

        // Create 8 employee details
        new Employee{ emp_id = 101, emp_name = "bobby", emp_age = 12},
        new Employee{ emp_id = 102, emp_name = "deepu", emp_age = 15},
        new Employee{ emp_id = 103, emp_name = "manoja", emp_age = 13},
        new Employee{ emp_id = 104, emp_name = "saroja", emp_age = 14},
        new Employee{ emp_id = 105, emp_name = "sravan", emp_age = 15},
        new Employee{ emp_id = 106, emp_name = "navya", emp_age = 12},
        new Employee{ emp_id = 107, emp_name = "majnu", emp_age = 12},
        new Employee{ emp_id = 108, emp_name = "vishnu", emp_age = 12},
    };

    // Iterate the Employee by selecting Employee
    // id greater than 101
    // Using where clause
    IEnumerable<Employee> Query =
    from employee in emp1 where employee.emp_id > 101 select employee;

    // Display employee details
    Console.WriteLine("ID  Name  Age");
    Console.WriteLine("+++++++++++++");
    foreach (Employee e in Query)
    {

        // Call the to string method
        Console.WriteLine(e.ToString());
    }
}
}

Output:

ID  Name  Age
+++++++++++++
102 deepu 15
103 manoja 13
104 saroja 14
105 sravan 15
106 navya 12
107 majnu 12
108 vishnu 12