how to solve this exception

Question

Imports Leo_myfile Public Class Form1 Inherits System.Windows.Forms.Form For Each favfile In favfiles.temp <-------- I have a null exception here Dim item As New ListViewItem item.Text = favfile.Name item.SubItems.Add(favfile.size) lstfile.Items.Add(item) Next End Sub End Class ------------------------------------------------------------------------------------------------------------ imports System.IO Public Class mywebfile Public temp As webfilecollection Dim folder As String = "c:\temp1\" Public Sub scanfolder() scanfolder(folder) End Sub Public Sub scanfolder(ByVal folder As String) Dim folders As New DirectoryInfo(folder) Dim file As FileInfo For Each file In folders.GetFiles If String.Compare(file.Extension, ".*", True) = 0 Then Dim myfile As New webfile myfile.load(file) temp.add(myfile) End If Next End Sub End Class ------------------------------------------------------------------------------------------------------------ Public Class webfilecollection Inherits CollectionBase Public Sub add(ByVal favorite As webfile) list.Add(favorite) End Sub Public Sub remove(ByVal index As Integer) If index >= 0 And index < Count Then list.Remove(index) End If End Sub Public ReadOnly Property item(ByVal index As Integer) As webfile Get Return CType(list.Item(index), webfile) End Get End Property End Class ------------------------------------------------------------------------------------------------------------ mports System.IO Public Class webfile Public Name As String Public size As String Public Sub load(ByVal fileInfo As FileInfo) Name = fileInfo.Name Dim stream As New FileStream(fileInfo.FullName, FileMode.Open) Dim reader As New StreamReader(stream) Do While True Dim buf As String If buf Is Nothing Then Exit Do If buf.EndsWith("b") Then size = buf.Substring(0) Exit Do End If Loop reader.Close() stream.Close() End Sub End Class how to solve the null An unhandled exception of type 'System.NullReferenceException' occurred in fileviewer.exe Additional information: Object reference not set to an instance of an object. please help me