Object reference not set to an instance of an object

jeg har kompilet følgende simple funktion:

Public Class fotofunktion
Public function fotocontrol() as System.Web.UI.Webcontrols.table
Dim cellecontrol as New Tablecell
Dim rowcontrol as New Tablerow
rowcontrol.Cells.Add(cellecontrol)
fotocontrol.Rows.Add(rowcontrol)
end function
end Class

Jeg tester den af på følgende måde:

Dim foto as new efb.fotofunktion()
response.write(foto.fotocontrol.Rows.count)

Desværre får jeg nedenstående fejl  - er der nogen der kan hjælpe:

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.