Write the following code using c #, Write a method that takes two arguments: a cost price and a two letter province code. It will calculate and display the selling price. (If province is Ontario a tax of 13% is added to the price, if the province is Quebec a tax of 17% is added to the cost price. There is no tax for the rest of the provinces and territories). In your main, call this method enough times to fully test it

Sure, here's the C# code for the method you described:

public void CalculateSellingPrice(double costPrice, string provinceCode) {
    double taxRate = 0.0;
    if (provinceCode == "ON") {
        taxRate = 0.13;
    } else if (provinceCode == "QC") {
        taxRate = 0.17;
    }
    double sellingPrice = costPrice * (1.0 + taxRate);
    Console.WriteLine("The selling price is: " + sellingPrice.ToString("C"));
}

And here's an example of how you could call this method in your `Main` function to test it:

static void Main(string[] args) {
    CalculateSellingPrice(100.0, "ON"); // This should output $113.00
    CalculateSellingPrice(100.0, "QC"); // This should output $117.00
    CalculateSellingPrice(100.0, "AB"); // This should output $100.00
}

Hope that helps!