Hi Thomas,

>Hello,
>
>I am working with VS2008 SP1 and MM 3.5 to build ASP Websites.
>When I click the ... Button in the Properties window to select the BindingSourceMember for a TextBox on a webpage, then I get the Error "Length cannot be less than zero. Parameter name: length". After the error Messagebox, I get the form to select the database etc., but all the field are empty, so that I can't select anything.
>The ...Button for the BindingSource works correctly.
>
>Pressing the .. Button to generate the ControlID to secure the control, brings up a Microsoft Visual Studio Message Box with the Error message "Length cannot be less than zero. Parameter name: length".
>
>Any ideas how to fix this behaviour?
>
>With regards
>Thomas

I don't know how to fix this but I have had the same issue. I assume you are setting the BindingSource (business object) first after you have registered the business objects with the form.. If working with SQL server sometimes I don't get the message but otherwise I do. I just type in the name of the member directly and it works fine.

I have not seen the same error on the ControlID property however. Is this the same exact error message?
Tim