Fibonacci series in C#

This is the C# code to generate the fibonacci series. 

static void Main(string[] args)
{

int iPrevious = -1; 
int iNext = 1;
int iNumber;


Console.WriteLine("Enter the total number you want to display the series");

iNumber= int.Parse(Console.ReadLine());

for (int i = 0; i < iNumber; i++)
{

int iSum = iNext + iPrevious; 
iPrevious = iNext;
iNext = iSum;

Console.WriteLine(iNext);
}
Console.ReadLine();
}