C# Online Compiler | .NET Fiddle

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

					
public class Program
{
	public static void Main()
	{
		// Student collection
		IList<Student> studentList = new List<Student>() { 
				new Student() { StudentID = 1, StudentName = "John", Age = 18, StandardID = 1 } ,
				new Student() { StudentID = 2, StudentName = "Steve",  Age = 21, StandardID = 1 } ,
				new Student() { StudentID = 3, StudentName = "Bill",  Age = 18, StandardID = 2 } ,
				new Student() { StudentID = 4, StudentName = "Ram" , Age = 20, StandardID = 2 } ,
				new Student() { StudentID = 5, StudentName = "Ron" , Age = 21 } 
			};
		
		IList<Standard> standardList = new List<Standard>() { 
				new Standard(){ StandardID = 1, StandardName="Standard 1"},
				new Standard(){ StandardID = 2, StandardName="Standard 2"},
				new Standard(){ StandardID = 3, StandardName="Standard 3"}
			};
		
		var innerJoinResult = studentList.Join(// outer sequence 
                      standardList,  // inner sequence 
                      student => student.StandardID,    // outerKeySelector
                      standard => standard.StandardID,  // innerKeySelector
                      (student, standard) => new  // result selector
                                    {
                                        StudentName = student.StudentName,
                                        StandardName = standard.StandardName
                                    });

		foreach (var obj in innerJoinResult)
		{
			
			Console.WriteLine("{0} - {1}", obj.StudentName, obj.StandardName);
		}
		
	}
		
}

public class Student{

	public int StudentID { get; set; }
	public string StudentName { get; set; }
	public int Age { get; set; }
	public int StandardID { get; set; }
}

public class Standard{

	public int StandardID { get; set; }
	public string StandardName { get; set; }
}

 
using System;
using System.Linq;
using System.Collections.Generic;
​
                    
public class Program
{
    public static void Main()
    {
        // Student collection
        IList<Student> studentList = new List<Student>() { 
                new Student() { StudentID = 1, StudentName = "John", Age = 18, StandardID = 1 } ,
                new Student() { StudentID = 2, StudentName = "Steve",  Age = 21, StandardID = 1 } ,
                new Student() { StudentID = 3, StudentName = "Bill",  Age = 18, StandardID = 2 } ,
                new Student() { StudentID = 4, StudentName = "Ram" , Age = 20, StandardID = 2 } ,
                new Student() { StudentID = 5, StudentName = "Ron" , Age = 21 } 
            };
        
        IList<Standard> standardList = new List<Standard>() { 
                new Standard(){ StandardID = 1, StandardName="Standard 1"},
                new Standard(){ StandardID = 2, StandardName="Standard 2"},
                new Standard(){ StandardID = 3, StandardName="Standard 3"}
            };
        

Cached Result

Please enter the diameter of your circle