>Frank,
>
>As it turns out this is an issue with ASP.NET. The code that retrieves the value from the ListBox really should work, but doesn't when you include the page inside a master page. To get this to work properly, you just need to add one line of code to lstUsers_SelectedIndexChanged():
>
>

try
>{
>    this.lstUsers.SelectedValue = Request.Form[lstUsers.UniqueID];
>    UserPk = this.lstUsers.SelectedValue;
>}

>
>Obviously, you can change this to one line of code and simply retrieve the value using Request.Form[] and then store the value in the UserPK variable.
>
>Best Regards,

Thanks Kevin,

that seems to have done the trick!