Object reference not set to an instance of an object.

Millkind
Millkind used Ask the Experts™
on
Why is Me.Controls("d" & currentlabel).Text = x saying that "Object reference not set to an instance of an object" How do i fix it?

            Dim currentmonth As Integer = DatePart(DateInterval.Month, dtpselector.Value)
            Dim currentyear As Integer = DatePart(DateInterval.Year, dtpselector.Value)
            Dim previousmonth As Integer = DatePart(DateInterval.Month, DateAdd(DateInterval.Month, -1, dtpselector.Value))
            Dim previousyear As Integer = DatePart(DateInterval.Year, DateAdd(DateInterval.Month, -1, dtpselector.Value))
            Dim nextmonth As Integer = DatePart(DateInterval.Month, DateAdd(DateInterval.Month, 1, dtpselector.Value))
            Dim nextyear As Integer = DatePart(DateInterval.Year, DateAdd(DateInterval.Month, 1, dtpselector.Value))
            Dim blankstofill As Integer = DatePart(DateInterval.Weekday, dtpselector.Value) - 1
            Dim currentenddate As Integer = Date.DaysInMonth(currentyear, currentmonth)
            Dim previousenddate As Integer = Date.DaysInMonth(previousyear, previousmonth)
            Dim currentlabel As Integer = 1
            'fill previous month data
            For x As Integer = blankstofill - previousenddate To previousenddate
                Me.Controls("d" & currentlabel).Text = x
                currentlabel += 1
            Next
            'fill current month data with no previous month data
            For x As Integer = 1 To currentenddate
                Me.Controls("d" & currentlabel).Text = x
                currentlabel += 1
            Next
            ''fill next month data
            For x As Integer = 1 To 42 - blankstofill - currentenddate
                Me.Controls("d" & currentlabel).Text = x
                currentlabel += 1
            Next

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Commented:
Do you have a label named "d1"?

Author

Commented:
Yes
High School Computer Science, Computer Applications, Digital Design, and Mathematics Teacher
Top Expert 2009
Commented:
There are only two possibilities:
(1) You've got the name wrong...you've ruled that out.
(2) You've got the wrong container.

Your code is:

    Me.Controls("d" & currentlabel)

The "Me" refers to the Form itself.  If the control is not directly contained by the form, then it will not be found.  For instance, that particular control might be in a Panel or a GroupBox.

To fix the problem, either:
(1) Replace "Me" with the proper container name, such as "Panel1" or "GroupBox1":

    Panel1.Controls("d" & currentlabel)

(2) Search for the control using code like below.  This will find the control where ever it is:
Dim matches() As Control
matches = Me.Controls.Find("d" & currentlabel, True)
If matches.Length > 0 AndAlso TypeOf matches(0) Is Label Then
    Dim lbl As Label = DirectCast(matches(0), Label)
    lbl.Text = x
End If

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Author

Commented:
Wonderful explanation.  I was using a tabcontrol and needed to change me to the tap page name.  Thanks so much.

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