source code how to calculate prime number in c#.net.With valid and correct output.

**Definition Of Prime Number:**- The number which is divisible by 1 and itself.

or we can say prime number is a number which has only two factor first one is 1 and second

is that number itself.

in this article i have shown to calculate prime number from one range to n range and also how to find

simple number is prime or not.

Now first to calculate whether entered number is prime number or not.

here is code:- on page init

protected void Page_init(object sender, EventArgs e)

{

int num=20, flag=0;

for (int i=2;i<;num/2++)//i will be less than half of number it will also work.

{

if(num%i==0)

{

flag=1; // now entered number 20 is divisible by 2 means 20 has another factor that is 2

so , it is not prime number no need to go in execution use break statement.

break;

}

else

{

flag=0;

}

}

if (flag==0)

{

Response.Write(" +num+"is not prime number :-");

Response.Write("</br>");

}

else

{

Response.Write( +num+"is a prime number :-");

}

}

}

It was simple program to check number is prime or not now i want to check number from n to n+...

or 1 to 20 , 1 to 100 , 1 to 1000 just enter num=100 or num=1000 as you want range.

protected void Page_init(object sender, EventArgs e)

{

int num=20, flag=0;

Response.Write("Prime Number from 2 to" +num+"is :-");

Response.Write("</br>");

for (int j=2;j<num;j++)

{

for (int i=2;i<j;i++)

{

if(j%i==0)

{

flag=1;

break;

}

else

{

flag=0;

}

}

if (flag==0)

{

Response.Write(j);

Response.Write("</br>");

}

}

}

}

**Prime Number from 2 to 20 is :-**

2

3

5

7

11

13

17

19

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