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Error: Object reference not set to an instance of an object.

Posted on 2012-04-05
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Last Modified: 2012-06-21
I have the following loop:

 
If fvShip.CurrentMode = FormViewMode.ReadOnly Then
            Dim bLinks() As LinkButton = {bLink, bLink1, bLink2, bLink3, bLink4}
            Dim lblFileLengths() As Label = {lblFileLength, lblFileLength1, lblFileLength2, lblFileLength3, lblFileLength4}
            For i As Integer = 0 To lblFileLengths.Length - 1
                If lblFileLengths(i).Text = "0" Then
                    bLinks(i).Visible = False
                End If
            Next
        End If

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and get the  Error: Object reference not set to an instance of an object at
  --If lblFileLengths(i).Text = "0" Then

can someone assist?
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Question by:JessyRobinson1234
2 Comments
 
LVL 14

Accepted Solution

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binaryevo earned 500 total points
ID: 37812369
Your code appears correct.  I wrote an example and was able to step through and confirm it working correctly.  Something is coming back as null in your labels it looks like.  Are you sure the labels have the correct properties set?  

Dim lbl1 As New Label()
        lbl1.Text = "0"
        Dim lbl2 As New Label()
        lbl2.Text = "1"
        Dim lbl3 As New Label()
        lbl3.Text = "2"

        Dim testFileLengths() As Label = {lbl1, lbl2, lbl3}
        For i As Integer = 0 To testFileLengths.Length - 1
            If testFileLengths(i).Text = "0" Then

                Dim s As String = "Im here"

            End If
        Next

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LVL 21

Expert Comment

by:mastoo
ID: 37813248
Can you look at the values in the debugger when the error occurs?
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