Use this following code i hope you will find the solution of your problem.
Program - Converting rs. to paisa
using System;
class Money
{
public static void Main()
{
float RsF;
string s;
Console.Write("Enter the amount in Rs. : ");
s = Console.ReadLine();
RsF = float.Parse(s);
Console.WriteLine("Amount in paise = " +(RsF*100));
Console.ReadLine();
}
}