Has anyone ever seen this error?

[NatGreen]

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

I am trying to set the datasource of a listbox on a form to the arraylist generated from a custom control.

My code looks like this:

Protected withevents listbox1 as System.Web.UI.WebControls.ListBox

Public Sub ListLoad (ByVal CntArray as arraylist)

Dim CntArray As ArrayList = New ArrayList()

CntArray.Add("Sam&quot
CntArray.Add("Joe&quot
CntArray.Add("Mike&quot

Listbox1.DataSource = CntArray
Listbox1.DataBind()
End Sub

 

[link9]

Your declaration indicates that you are passing in the CntArray, but then you dimension one, as well...

From the looks of your code, you should make the declaration look like this:

Public Sub ListLoad ()

 

[NatGreen]

I have tried your suggestion and I still get the same error. Any ideas?

Thanks.
NatGreen

 

[link9]

What line does it error on?

 

[NatGreen]

Here is the cleaned up version of the aspx and ascx
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
aspx:

Protected WithEvents Listbox1 As System.Web.UI.WebControls.ListBox

Public Sub ListLoad(ByVal TheNewArray As ArrayList)
If TheNewArray.Item(0) <> &quot;&quot; Then
Listbox1.DataSource = TheNewArray
Listbox1.DataBind()
End If
End Sub
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ascx:

Protected WithEvents DDLUsers As System.Web.UI.WebControls.DropDownList

Public WithEvents newform As WebApplication4.Form2

Public Sub DDLUsers_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DDLUsers.SelectedIndexChanged

Dim NewArrayList As New ArrayList()

NewArrayList.Add(&quot;Sam&quot
NewArrayList.Add(&quot;Joe&quot
NewArrayList.Add(&quot;Mike&quot

newform.ListLoad(NewArrayList)
End Sub
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The error occurs when it tries to set the datasource = to the array.

Any ideas?

 

[NatGreen]

I have found my error. I needed to but the databinding in the page load event of the form. Everything seemed to work okay after that.

Regards,
NatGreen