Calculates and display gallons of water used and total charged

Code an application so that it calculates and displays the number of gallons of water used and the total charge for water. the charge for the water is $1.75 per 1000 gallons or .00175 per gallon. Make the calculations  only when the current meter reading is greater than or equal to the previous meter reading; other wise diplay an approiate message.Displya total charge with a dollar sign and two decimals. the text boxes should only accept numbers and th backspace key.Clear number of gallons used and the total charge when a change is made to contents. when a text box receives focus, select its exsisiting text.

I have attached the zip file of what I have so far  
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HainKurtConnect With a Mentor Sr. System AnalystCommented:
use Convert.ToInt32

dim pRead as int = Convert.ToInt32(Txtprevious.Text)
dim cRead as int = Convert.ToInt32(TxtCurrent.Text)
dim totalCharge as double

if (pRead<cRead) then
  totalCharge  = (cRead-pRead) * 0.00175
  lbltotalcharge.Text = totalCharge.ToString("#,000.00")
end if

check here for more formatting options:
HainKurtSr. System AnalystCommented:
your attached file is not showing any code... you posted solution file by mistake instead of code file...
sweety53216Author Commented:
ublic Class Form1

    Private Sub TextBox5_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)

    End Sub

    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click

This is what I have so far

    End Sub

    Private Sub bntCalc_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles bntCalc.Click
        'calculates total gallons and total charge

        lbltotalgallons.Text = Val(TxtCurrent.Text) - Val(Txtprevious.Text)
        lbltotalcharge.Text = Val(lbltotalgallons.Text) * 0.00175
        lbltotalcharge.Text = Format(lbltotalcharge.Text, "currency")
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