Array List Display in GridView

[berkshire123]

Using VB.NET I am trying to display an arraylist in a gridview. I am having a few problems:
-Doing the DataBind above is adding an extra column to my gridview which I do not want. How can I stop this from being visible? I only want to show the column defined in the aspx file.
-The Delete button is not matching up with the selected row. When defining the 'varOldName' in the below code, it is showing me the error message 'Object reference not set to an instance of an object.' Can anyone show me what I am doing wrong here?

<asp:GridView ID="gvNames" runat="server"    
OnRowDeleting="gvNames_SelectedIndexChanged"    
AllowSorting="true"    
OnSorting="TaskGridView_Sorting">    
<columns>    
<asp:TemplateField HeaderText="Names" SortExpression="true">    
<ItemTemplate>    
<asp:Label ID="Label1" runat="server" Text='<%# Container.DataItem %>'></asp:Label>    
</ItemTemplate>    
</asp:TemplateField>    
<asp:CommandField HeaderText="Delete" ShowDeleteButton="true" />    
</columns>    
</asp:GridView>

Public Sub GetDataForGrid(Optional ByVal varNewName As String = "", Optional ByVal varOldName As Integer = -10)    
Try    
  
'Create an in-memory collection of 4 Person objects    
Dim lstNameList As ArrayList = New ArrayList    
lstNameList.Add("First Second")    
lstNameList.Add("One Two")    
lstNameList.Add("Three Four")    
lstNameList.Add("Five Six")    
  
'Loop through each arraylist item to manipulate the name string for display    
Dim lstNameListReverse As ArrayList = New ArrayList    
For i As Integer = 0 To lstNameList.Count - 1    
Dim FirstName As String = lstNameList(i).ToString.Substring(0, lstNameList(i).IndexOf(" "))    
Dim LastName As String = lstNameList(i).ToString.Substring(lstNameList(i).IndexOf(" ") + 1)    
Dim FullName As String = LastName + "," + FirstName    
lstNameListReverse.Add(FullName)    
Next    
  
  
'Bind the data to the gridview    
gvNames.DataSource = lstNameListReverse    
gvNames.DataBind()    
gvNames.Columns.Item(2).Visible = True    
  
  
'Put the arraylist in a session value    
Session("MyArrayListData") = lstNameListReverse    
  
Catch ex As Exception    
MsgBox(ex.Message)    
End Try    
  
End Sub

Protected Sub gvNames_SelectedIndexChanged(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)    
Try    
  
Dim lstListToRemoveFrom As ArrayList = Session("MyArrayListData")    
Dim varNewName As String = ""    
Dim varOldName As Integer = gvNames.SelectedRow.DataItem    
  
GetDataForGridSession(varNewName, varOldName)    
  
Catch ex As Exception    
MsgBox(ex.Message)    
End Try    
  
End Sub