What is the best DL software to practice C sharp by using this code??i am utilizing the examples but it appears that the sources that I am comparing are using a different software 

Module Module1

    Sub Main()

        Dim purchase As Decimal = 0

        Dim total As Decimal = 0

        Console.WriteLine("Enter an amount.")

        Console.WriteLine("Enter a value of -1 when complete.")

        Console.WriteLine()

        While purchase <> -1

            Console.Write("$")

            purchase = Console.ReadLine()

            If purchase >= 50 Then

                Console.WriteLine("          10% Discount: -$" & purchase * 0.1)

                purchase = purchase - (purchase * 0.1)

                Console.WriteLine("$" & purchase)

                total = purchase + total

            Else

                total = purchase + total

            End If

        End While

        Console.WriteLine()

        Console.WriteLine("Your total price is $" & total + 1)

        Console.ReadLine()

    End Sub

End Module