Subtract Value From GPA?

May 20, 2010

I'm doing this program in Visual Basic and its supposed to calculate the GPA by entering the completed courses in a listbox. Its does calculate the GPA as its supposed to by adding the values using a "Add to list" button, but i have to also update the value of the GPA if a remove an item from the listbox using a "Remove from List" button. Is there a way a remove the line and also make the subtraction work.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddtoList.Click
'This is the Add button
course = txtCourseName.Text

[code]....

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Code:
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[code]....

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[Code]...

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Spoiler
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[Code]....

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DateTime.TryParse(TextBox1.Text, d1)
DateTime.TryParse(TextBox2.Text, d2)

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[Code].....

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[Code]....

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[Code]...

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[Code]...

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[Code].....

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Im creating a registration application where i have a listbox that displays a Course Name column and a Credit Hours column. I also have a textbox that keeps a running total of the credit hours of each course added to the list. When i remove a specific item from the list, i also want to subtract the number of the selected item from the running total in the text box. Essentially i just want to subtract a certain part of a list item from a variable i have.

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DateTime.TryParse(TextBox1.Text, d1)
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[code].....

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CODE:

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