Scott Phillip's Handy Hint #1:

When working with currency you generally can't put in a "$" sign within a text field since it's counted as a String instead of an Integer/Single/Double etc.

However, when a text field has been locked so the user can't touch it in any way (such as in a calculator), theres a neat little trick you can do to show a "$" both before and after the user inputs any data for calculation.

Example:
Try
Dim AccNumber As Integer = Integer.Parse(txtAccNumber.Text)
Dim StartBalance As Integer = Integer.Parse(txtStartBalance.Text)
Dim Charges As Integer = Integer.Parse(txtCharges.Text)
Dim Credits As Integer = Integer.Parse(txtCredits.Text)
Dim NewBalance As Integer

NewBalance = (StartBalance - Charges) + Credits
Me.txtNewBalance.Text = NewBalance.ToString
' txtNewBalance.Clear()
txtNewBalance.Text = Format(NewBalance, "$0.00")

' Down here with the format function you can change the way the number appears. Such as with a "$" sign.
' Alternatively, if you wish to show the "$" sign before data has even been calculated, in the properties window under Text by inserting a "$".
' You can then add "theTextFieldName".Clear() such as shown above before the calculation to clear the field before it reads the String and errors, _
' ($ being the string)

Catch ex As System.Exception
MessageBox.Show("There were Blank or Non-numeric data that was inputted.", "Blank or Non-numeric", MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try