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C# - Example of where() Method of List Collection using LINQ (Print students list whose name contains 4 characters)

Learn, how to find the list of students whose name contains 4 characters using where() method of List collection using Linq? By Nidhi Last updated : April 01, 2023

Here we will find the list of students whose name contains 4 characters. Here we will use the where() method. In the where() we will specify the condition to select student names contains 4 characters. To use where() method we need to import "System.Linq" and "System.Collections.Generic" namespaces.

C# program to print students list whose name contains 4 characters using where() method of List collection using LINQ

The source code to find the list of students whose name contains 4 characters, is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

//Program to find a list of students whose name contains 
//4 characters using Where() method of List collection using Linq.

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

class Demo {
  static void Main(string[] args) {
    List < string > Students = new List < string > ();

    Students.Add("Amit");
    Students.Add("Sumit");
    Students.Add("Ayan");
    Students.Add("Shaurya");
    Students.Add("Sanaya");

    IEnumerable < string > result = Students.Where(stu => stu.Length == 4);

    Console.WriteLine("Student Names:");
    foreach(string name in result) {
      Console.WriteLine(name);
    }
  }
}

Output

Student Names:
Amit
Ayan
Press any key to continue . . .

Explanation

In the above program, we created a list and then add student names to the using Add() method.

IEnumerable<string> result = Students.Where(stu=>stu.Length==4);

In the above code, where() method is used to select student according to a specified condition. Here we find the students whose name contains 4 characters.

Console.WriteLine("Student Names:");
foreach (string name in result)
{
    Console.WriteLine(name);
}

Here we printed the select student name using "foreach" on the console screen.

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