How to add up amount of data from an external file in C# (Stream Reader)

Question

I'm new to this site, and pretty new to programming, at the moment I'm trying to display a count amount for the users names on my donation list, and then I also want to have a sum to work out the total amount of money the donation list contains, If someone could help me with creating a way to add up amount of donors on the donations.txt file that would be great help, I have no idea where to start, but so far this is my coding:

        string sName;
        double dAmount;
        string sTotalNames;
        double dAmountTotal;
        double dAmountAverage;

    using (StreamReader sr = new StreamReader("Donations.txt"))
    {
        while (sr.Peek() != -1)
        {
            sName = sr.ReadLine();
            Console.WriteLine(sName);

            dAmount = Convert.ToDouble(sr.ReadLine());
            Console.WriteLine(dAmount);
        }

        Console.WriteLine("Press any key to close");
        Console.ReadKey();
    }

Answer 1

Assuming everything else you have works correctly, creating a sum would be pretty easy.

string sName;
double dAmount;
int sTotalNames = 0;
double dAmountTotal = 0;
double dAmountAverage;

using (StreamReader sr = new StreamReader("Donations.txt"))
{
    while (sr.Peek() != -1)
    {
        sName = sr.ReadLine();
        Console.WriteLine(sName);

        dAmount = Convert.ToDouble(sr.ReadLine());
        Console.WriteLine(dAmount);
        dAmountTotal += dAmount;
        sTotalNames++;
    }
    dAmountAverage = dAmountTotal / sTotalNames;
    Console.WriteLine("Sum = {0}", dAmountTotal );
    Console.WriteLine("Total Names = {0}", sTotalNames);
    Console.WriteLine("Average Amount = {0}", dAmountAverage);
    Console.WriteLine("Press any key to close");
    Console.ReadKey();
}