Program for Prime or Not

Source :

using System;
class Prime
{
static void Main()
{
int n,count=0;
Console.Write("Enter a number : ");
n=int.Parse(Console.ReadLine());
for(int i=1;i<=n;i++)
{
if(n%i==0)
count ++;
}
if(count==2)
Console.WriteLine("{0} is Prime number",n);
else
Console.WriteLine("{0} is not Prime number",n);
}
}

Output:
i) Enter a number : 9
9 is not Prime number

ii) Enter a number : 11
11 is  Prime number

Program for Even or Odd

Source:
using System;

class EvenorOdd
{
   static void Main()
  {
     int n;
     Console.WriteLine("Enter a number : ");
     n= int.Parse(Console.ReadLine());
     if(n%2==0)
     Console.WriteLine("The given number {0} is Even",n);
     else
     Console.WriteLine("The given number {0} is Odd",n);
  }
}

Output :
i)
 Enter a number :
 54
The given number 54 is Even

ii)
 Enter a number :
9
The given number 9 is Even

Program for Hello World

Source :

using System;

class HelloWorld
{
  static void Main()
  {
     Console.WriteLine("Hello World....!");
   }
}

Output :   Hello World....!