Which of the following is correct way to convert a String to an int?

1. String s = "123"; 
   int i;
   i = (int)s;

2. String s = "123";
   int i;
   i = int.Parse(s);

3. String s = "123"; 
   int i;
   i = Int32.Parse(s);

4. String s = "123"; 
   int i;
   i = Convert.ToInt32(s);

5. String s = "123"; 
   int i;
   i = CInt(s);

1. Constructors cannot be overloaded.
2. Constructors always have the name same as the name of the class.
3. Constructors are never called explicitly.
4. Constructors never return any value.
5. Constructors allocate space for the object in memory.

namespace CuriousTabConsoleApplication
{
    class Sample
    { 
        public static void fun1()
        { 
            Console.WriteLine("CuriousTab1 method");
        }
        public void fun2()
        { 
            fun1(); 
            Console.WriteLine("CuriousTab2 method");
        }
        public void fun2(int i)
        { 
            Console.WriteLine(i);
            fun2(); 
        } 
    } 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            Sample s = new Sample(); 
            Sample.fun1(); 
            s.fun2(123);
        } 
    } 
}

Tab1 method 
123
Tabl method 
Tab2 method

Tab1 method 
123
Tab2 method

Tab2 method 
123
Tab2 method 
Tabl method

Tabl method
123

Tab2 method 
123
Tabl method

class Sample
{
    public int Length
    {
        set
        {
            Length = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        }
        set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        WriteOnly set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        set
        {
            len = value;
        }
    } 
}

1. An enum can be declared inside a class.
2. An enum can take Single, Double or Decimal values.
3. An enum can be declared outside a class.
4. An enum can be declared inside/outside a namespace.
5. An object can be assigned to an enum variable.