private void button3_Click(object sender, EventArgs e)
{
    if (!this.textBox3.ReadOnly)
    {
        int length = this.textBox3.Text.Length;
        int num2 = 0;
        for (int i = 0; i < length; i++)
        {
            num2 += this.textBox1.Text[i];
            num2 *= i;
        }
        num2 /= 2;
        if (this.textBox4.Text == num2.ToString())
        {
            this.textBox6.ReadOnly = false;
        }
        else
        {
            MessageBox.Show("Wrong Password!", "Error");
        }
    }
}

#include <iostream.h>
#include <conio.h>
#include <string.h>
using namespace std;

int main()
{
char *name;
char *name2="HgRAhquDd";
long serial, num=0;
int i;

cout<<"Enter your name:";
cin>> name;
int length=strlen(name);
for (i=0; i<length; i++)
{
 num+=name2[i];
 num*=i;
}
serial=num/2;
cout<< "\n"<< "Serial:"<< serial<<"\n";
cout<< "\n";
cout<< "Press and key to Exit...";
getch();
return 0;
}