Generate fibonacci Series (c# / .NET)

This function is for the beginners as a sample function to generate the Fibonacci series in c#. It takes a number 'n' as an argument ( i.e count of series ) and returns a dictionary with index and values. The basic algorithm is used to calculate the series. Also, the limitations and comments are written within the code.

// returns a dictionary with index and value of Fibonacci series for 'n' counts.

// Currently, the value should not be greater than 9223372036854775807, as we are using Int64 a value type. 

        public Dictionary<int,Int64> GetFibonacciSeries(int n)

        {

            // declaration of variables

            Int64 a = 0, b = 1, temp = 0;

            // declare returnlist as dictionary. It returns a dictionary with index and value of Fibonacci series.

            Dictionary<int, Int64> returnList = new Dictionary<int, Int64>();

            // by default add 0 and 1 to the dictionary.

            returnList.Add(1, a);

            returnList.Add(2, b);

            // perform calculations for remaining counts.

            for (int i = 3; i <= n; i++)

            {

                temp = a + b;

                returnList.Add(i, temp);

                a = b; b = temp;

            }

            // returns the populated dictionary.

            return returnList;

        }