Writing Code For Currency?

I am trying to write a code to set a service charge for a checking account to calculate by adding $4.50 to a value computed by using the following specifications: $0.14 per check if less than 10 checks were used, $0.13 per check if less than 25 checks were used, $0.10 per check if less than 50 checks were used, and $0.08 per check if more than 50 checks were used. How do I write $ in a code?

Here is the code I wrote:

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Val(TextBox1.Text) < 10 Then

[code]....