Gas Gauge

[sweber25]

I would like to know how to program a "gas gauge" if you will. I know the MPG of our shuttle and the mileage for each shuttle run but I am not sure how to make the gas gauge work. I am using a progress bar for that. Any ideas? Any help would be appreciated.

[Hack]

I don't understand the question.

What is the progress bar supposed to show the progress of?

[sweber25]

Okay, sorry. I have a Shuttle Van Program that I am working on and I am using a progress bar to simulate a fuel gauge. Whenever a user inserts a new shuttle run I want it to calculate the fuel consumption and show it on the progress bar. How do I do that?

Also, I am having trouble adding the miles to the destination to the mileage on the car. I get 89000.5 and it only does it once for some reason. I am using My.Settings to store mileage and adding to it as each shuttle run is put into the database.

Try
            Dim NewMPG As Decimal
            NewMPG = lblMiles.Text + MilesTextBox.Text
            lblMiles.Text = NewMPG
            My.Settings.Mileage = lblMiles.Text
            My.Settings.Save()
            lblMiles.Text = "ESTIMATED VEHICLE MILEAGE: " &   My.Settings.Mileage
        Catch ex As Exception

        End Try

[jmcilhinney]

You are assuming that this:

NewMPG = lblMiles.Text + MilesTextBox.Text

will automatically convert both strings to numbers for you, which it won't. "1" + "2" is "12", not "3". Additions of strings is concatenation. If you want to add numbers then you need to have numbers. You shouldn't be using the Text of the Label at all because in order to display a number in a Label you must have had a number in the first place, so you should use that. As for the TextBox, you could use a NumericUpDown instead, or you could use Decimal.TryParse to convert the Text of the TextBox.