C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Collections;

public class Student
{
	public string Name
	{
		get;
		set;
	}

	public int Age
	{
		get;
		set;
	}

	public double Mark
	{
		get;
		set;
	}

	public Student(string name, int age, double mark)
	{
		Name = name;
		Age = age;
		Mark = mark;
	}
	
	public string GetData()				//Creating a method to display the Student details.
	{
		return "The name of the student is "+Name+".He is "+Age+" years old. He scored "+Mark+" in the exam";
	}
}

public class Program
{
	public static void Main()
	{
		Student S1 = new Student("Abhi", 17, 98);
		Student S2 = new Student("George", 20, 90.5);
		Student S3 = new Student("Kevin", 22, 99.5);
		
		Hashtable studHT = new Hashtable();
		
		studHT.Add(1, S1);
		studHT.Add(2, S2);
		studHT.Add(3, S3);
		
		string student1 = ((Student)studHT[1]).GetData();		//Calling the GetData method by typecasting the ArrayList Student object.
		Console.WriteLine(student1);
		
		string student2 = ((Student)studHT[2]).GetData();
		Console.WriteLine(student2);
	}
}

​x
 
using System;
using System.Collections;
​
public class Student
{
    public string Name
    {
        get;
        set;
    }
​
    public int Age
    {
        get;
        set;
    }
​
    public double Mark
    {
        get;
        set;
    }
​
    public Student(string name, int age, double mark)
    {
        Name = name;
        Age = age;
        Mark = mark;
    }
    
    public string GetData()             //Creating a method to display the Student details.
    {
        return "The name of the student is "+Name+".He is "+Age+" years old. He scored "+Mark+" in the exam";
    }
}
​
public class Program
{
    public static void Main()
    {
        Student S1 = new Student("Abhi", 17, 98);
        Student S2 = new Student("George", 20, 90.5);
        Student S3 = new Student("Kevin", 22, 99.5);
        
        Hashtable studHT = new Hashtable();
        
        studHT.Add(1, S1);
        studHT.Add(2, S2);
        studHT.Add(3, S3);
        
        string student1 = ((Student)studHT[1]).GetData();       //Calling the GetData method by typecasting the ArrayList Student object.
        Console.WriteLine(student1);
        
        string student2 = ((Student)studHT[2]).GetData();
        Console.WriteLine(student2);
    }
}

Compilation error (line 1, col 0): Declaration expected.
Compilation error (line 3, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 3, col 0): Syntax error.
Compilation error (line 4, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 4, col 0): Declaration expected.
Compilation error (line 5, col 0): Declaration expected.
Compilation error (line 5, col 0): Declaration expected.
Compilation error (line 5, col 0): Syntax error.
Compilation error (line 6, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 6, col 0): Syntax error.
Compilation error (line 7, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 7, col 0): Syntax error.
Compilation error (line 8, col 0): Declaration expected.
Compilation error (line 9, col 0): Character is not valid.
Compilation error (line 9, col 0): Declaration expected.
Compilation error (line 9, col 0): Syntax error.
Compilation error (line 10, col 0): Character is not valid.
Compilation error (line 10, col 0): Declaration expected.
Compilation error (line 10, col 0): Syntax error.
Compilation error (line 11, col 0): Character is not valid.
Compilation error (line 11, col 0): Declaration expected.
Compilation error (line 11, col 0): Syntax error.
Compilation error (line 12, col 0): Character is not valid.
Compilation error (line 12, col 0): Declaration expected.
Compilation error (line 12, col 0): Syntax error.
Compilation error (line 13, col 0): Character is not valid.
Compilation error (line 13, col 0): Declaration expected.
Compilation error (line 13, col 0): Syntax error.
Compilation error (line 14, col 0): Character is not valid.
Compilation error (line 14, col 0): Declaration expected.
Compilation error (line 14, col 0): Syntax error.
Compilation error (line 15, col 0): Character is not valid.
Compilation error (line 15, col 0): Declaration expected.
Compilation error (line 15, col 0): Syntax error.
Compilation error (line 16, col 0): Character is not valid.
Compilation error (line 16, col 0): Declaration expected.
Compilation error (line 16, col 0): Syntax error.
Compilation error (line 17, col 0): Character is not valid.
Compilation error (line 18, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 18, col 0): Syntax error.
Compilation error (line 19, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 19, col 0): Syntax error.
Compilation error (line 20, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 20, col 0): Syntax error.
Compilation error (line 21, col 0): Character is not valid.
Compilation error (line 21, col 0): Declaration expected.
Compilation error (line 21, col 0): Syntax error.
Compilation error (line 22, col 0): Character is not valid.
Compilation error (line 22, col 0): Declaration expected.
Compilation error (line 22, col 0): Syntax error.
Compilation error (line 23, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 23, col 0): Syntax error.
Compilation error (line 24, col 0): Declaration expected.
Compilation error (line 25, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 25, col 0): Declaration expected.
Compilation error (line 25, col 0): Syntax error.
Compilation error (line 26, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 26, col 0): Declaration expected.
Compilation error (line 26, col 0): Syntax error.
Compilation error (line 27, col 0): Labels are not valid outside methods/multiline lambdas.
Compilation error (line 27, col 0): Declaration expected.
Compilation error (line 27, col 0): Syntax error.
Compilation error (line 20, col 0): Type 'Customer' is not defined.
Compilation error (line 21, col 0): Type 'Customer' is not defined.
Compilation error (line 40, col 0): Type 'Customer' is not defined.
Compilation error (line 41, col 0): Type 'Customer' is not defined.

Last Run:	1:20:20 pm
Compile:	0s
Execute:	0.204s
Memory:	0b
CPU:	0s

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