We can use Convert.ToInt32 method for conversion from string to Integer Number.
Obvisouly We can use Int.Parse Method also.
Convert.ToInt32 is another Method to get input from user.
Some Examples :
int i1 = Convert.ToInt32(Console.ReadLine());
DateTime i2 = Convert.ToDateTime(Console.ReadLine());
decimal i3 = Convert.ToDecimal(Console.ReadLine());

Thanks.