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progress bar

Posted on 2013-05-23
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Last Modified: 2013-06-20
I am using the following code for my progress bar.  It increments as progress is made but when it gets to the end of the cycle the green progress indicator is not all the way to the end. Why?


Dim percentage As Integer
For i As Integer = 1 to TotalCount

    ' ... some work ...

    percentage = i / TotalCount * 100
    ProgressBar1.Value = percentage ' <-- assuming default Min = 0, Max = 100
    Application.DoEvents()
Next
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Question by:vbnetcoder
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6 Comments
 
LVL 25

Expert Comment

by:SStory
ID: 39191027
I'd bet because of rounding. Instead of doing a percent, set Max to whatever the max number of items are and increment value accordingly and see if it works.
Also try outputting the value of percentage to see if it every reaches 100.
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LVL 1

Expert Comment

by:dbote
ID: 39192130
Not sure but your calculation of....

percentage = i / TotalCount * 100

Should be

percentage = (i / TotalCount) * 100
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 39192307
Since division and multiplication are equal in the order of precedence for operators, the equation will be evaluated from left to right.  Your addition of parenthesis is changing nothing but aesthetics!...  =)
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Expert Comment

by:dbote
ID: 39192453
True.  Sorry.
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Accepted Solution

by:
Jacques Bourgeois (James Burger) earned 2000 total points
ID: 39197883
First of all, why all these percentage manipulations. Simply set the Maximum to TotalCount before going into the loop, and the following will work a little faster because it does not need to multiply and divide:

    ProgressBar1.Maximum = TotalCount
    For i As Integer = 1 To totalcount

      ' ... some work ...

      ProgressBar1.Value = i
      Application.DoEvents()
    Next

Anyway, I tested your code as is, and it works flawlessly. The Progress Bar is filled when finished, although the last block might end up being smaller than the other ones because the width of the control might not leave enough space.

I suspect that your problem might be in   ' ... some work ...

Have you checked to make sure that after the loop. ProgressBar1.Maximum and percentage are at the same value? Is it possible that there is an Exit For somewhere in the loop?
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Author Closing Comment

by:vbnetcoder
ID: 39263318
ty
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