What is wrong in the following code for previous button?

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What is wrong in the following code for previous button?
please answer me.
If n = dt.Rows.Count Then
n = 0
Else
tbid.Text = dt.Rows(n).Item("ID").ToString
tblocation.Text = dt.Rows(n).Item("Location").ToString
cboprovince.Text = dt.Rows(n).Item("Province").ToString
tbtype.Text = dt.Rows(n).Item("Type").ToString
tbwidth.Text = dt.Rows(n).Item("Width").ToString
tbheight.Text = dt.Rows(n).Item("Height").ToString
tbremarks.Text = dt.Rows(n).Item("Remarks").ToString
'PictureBox1.Image = dt.Rows(n).Item("Photo").ToString
Dim billboardimage() As Byte = CType(dt.Rows(n).Item("Photo"), Byte())
Dim ms As New MemoryStream(billboardimage)
PictureBox1.Image = Image.FromStream(ms)
n -= 1
End If

Posted 28-Jun-14 21:41pm

Member 10836376

Updated 28-Jun-14 21:45pm

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OriginalGriff · Answer 1 · 2014-06-28T22:07:00

Um.

You don't see it?
Suppose you have three items, and you are viewing the second:
n == 1
Count == 3
You execute your code, and n becomes n - 1 : now n == 0
You execute your code, and n is checked against 3, it isn't, so you continue and n becomes n - 1 : now n == -1
You execute your coed, and check n agains 3. It still isn't, so you continue....and n continues to get more and more negative (well, actually it won't, because your app will crash the moment it is negative, but you get the idea...)

Please, learn to use the debugger, and follow your code through: if you had, you would have spotted this yourself in a couple of seconds!

What is wrong in the following code for previous button?

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What is wrong in the following code for previous button?

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