I apologize. May have been some sloppy copy/pasting.  Both are ModuleName_SelectAll within live testing code.

Nathan,

Success!  Appreciate your feedback.
Interestingly enough, this standard ModuleID Sub was not included in this testing.  Although, upon examining the rest of the coding, I found a certain doubled class that was the main cause for the error.  Although I did find a bunch of developers out there who have encountered this error in other regards:  http://geekswithblogs.net/chrishan/archive/2005/07/13/46223.aspx

To recap, the DataList can be accessed either through codebehind with conversion from integer to string or by controller, which requires ObjectDataSource.  The more options for developing, the better.  I will now work with UPDATING & DELETING stored database values a to ensure the controller is working properly together with DataList.

Because the UPDATE & DELETE functions are also included within controller, retrieving values according to selected DataList items within ASCX can get tricky. 
The DataList is binding using the following:  

ASCX
FieldName: <asp:TextBox ID="TextBox1" runat="server" Text=<%# Bind("FieldName") %> Visible="true"></asp:TextBox>

CONTROLLER
<DataObjectMethod(DataObjectMethodType.Update)> _
Public Shared Sub TableName_Update(ByVal ModuleNameInfo As ModuleNameInfo)
DataProvider.Instance().ExecuteNonQuery("ModuleName_Update", ModuleNameInfo.ID, ModuleNameInfo.ModuleId, GetNull(ModuleNameInfo.PortalID.ToString), GetNull(ModuleNameInfo.UserID.ToString)) ...etc.
End Sub

Within the DataList Template, there is a Update button:
<asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>


Including the code:  CommandName = "Update"  or CommandName = "ModuleName_Update"  just isn't enough.  Although the DataList is databound, it makes sense the update is not occuring, since the controller does not reference DataList values.  Using the initial post response would convert value from integer to string, but values and code is not defined or recognized from within controller.  So it seems to be a question of associating the DataList items with controller values, and of course relative only to the selected update ID.

* Just saw the post above.  Possibly may find answer within.  Keep all posted.