.ascx.vb files for user controls removed

The SaveData method in ASCX code-behind files for Visual Basic.NET has new signatures. 

Migration effects

During migration, all .ASCX files are deleted.  New .ASCX files are created when your application is rebuilt.

What you should do

After migration, re-apply any customizations you may have made to the original code-behind files.

See Also

Version 7.0 Application Migration