using System;
class StudentReferences

{
  
    public static void Main()

    {

       string[] classOne = { "Allan", "Chris", "Monica" };
       string[] classTwo = { "Katie", "Niel", "Mark" };
       Console.WriteLine("Students of Class I:\tStudents of Class II");
      
       for (int i = 0; i < 3; i++)
      
       {
           Console.WriteLine(classOne[i] + "\t\t\t" +  classTwo[i]);
   
       }
       
       classTwo = classOne;
       Console.WriteLine("\nStudents of Class II after referencing Class I:");
       for (int i = 0; i < 3; i++)
       {
           
          Console.WriteLine(classTwo[i] + " ");
     
       }
       Console.WriteLine();
       classTwo[2] = "Mike";
       Console.WriteLine("Students of Class I after changing the third student in Class II:");
       for (int i = 0; i < 3; i++)    
       {
    
           Console.WriteLine(classOne[i] + " ");
       }
     }
} 

       type [,]<variableName>;
       variableName = new type[value1 , value2];
 
 where,
     
      type: Specifies the data type of the arrays element.
     
      [,]: Specifies that the array is a two-dimensional array.
   
      variableName: Specifies the name of the two-dimensional array.

      new: Is the operator used to instantiate the arrays.

      value1: Specifies the number of rows in the two-dimensional array.

      value2: Specifies the number of columns in the two-dimensional array.

 using System;
 class StudentScore
 {

          void StudentDetails()
         
          {
           
               Console.Write("Enter the number of Students: ");
               int noOfStds = Convert.ToInt32(Console.ReadLine());
               Console.Write("Enter the number of Exams: ");
               int exams = Convert.ToInt32(Console.ReadLine());
               string[] stdName = new string[noOfStds];
               string[,] details = new string[noOfStds, exams];
               for (int i = 0; i < noOfStds; i++)
              
               {
                    Console.WriteLine();
                    Console.Write("Enter the Student Name: ");
                    stdName[i] = Convert.ToString(Console.ReadLine());
                    for (int y = 0; y < exams; y++)
                    {

                         Console.Write("Enter Score in Exams " + (y + 1) + ": ");
                         details[i, y] = Convert.ToString(Console.ReadLine());

                    }
               }             
              
               Console.WriteLine();
               Console.WriteLine("Student Exam Details");
               Console.WriteLine("--------------------");
               Console.WriteLine();
               Console.WriteLine("Student\t\tMarks");
               Console.WriteLine("-----\t\t------");                  
               for (int i = 0; i < stdName.Length; i++)
               {
                    Console.WriteLine(stdName[i]);
                    for (int j = 0; j< exams; j++)
                    {
                         Console.WriteLine("\t\t" + details[i, j]);
                    
                    }
                    Console.WriteLine();
 
               }
            }
            static void Main()
            {

                StudentsScore objStudentsScore = new StudentsScore();
                objStudentsScore.StudentDetails();

            }
 }

 using System;
 class Sports
 {
    
         static void Main(string[] args)
         {

                string[] atheleteNames = new string[] { "Alton White","Mary Cruz","Susan Dias" };
                string[][] events = new string[3][];
                events[0] = new string[] { "100 Mts Sprint", "200 Mts Sprint", "High Jump", "Relay" };
                events[1] = new string[] { "Tripple Jump", "Hurdles", "Long Jump" };
                events[2] = new string[] { "200 Mts Sprint", "High Jump" };
                Console.WriteLine("Participants\tEvents");
                for (int i = 0; i < events.GetLength(0); i++)
                {

                     Console.Write("{0} \t",atheleteNames[i]);
                     for (int j = 0; j < events[i].GetLength(0); j++)
                     {

                          Console.Write("[{0}] ",events[i][j]);
                       
                     }
                     Console.WriteLine();
                }

          }
 }