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Why sandboxed solution cannot load class?

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :SharePoint
Let's say I have a sandboxed web part with GridView. GridView has sortable columns. I need to store field name and sort order in the viewState. I add two properties to the web part (user control) class:         private string OrderByFieldName         {             get             {                 object o = ViewState["OrderByFieldName"];                 if (o == null)                     return "EmploymentStartDate";                 else                     return o as string;             }             set             {                 V

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I'm trying to deploy a sandboxed solution but I don't succeed.
I created an empty sharepoint project, added a (regular) webpart to it and that's it. Didn't add any code of my own to the project.

Then I hit F5 to deploy it to my sharepoint server (visual studio and sharepoint running on the same machine)

First it gives me an attach security warning, where I hit "attach"
Then a message about scrip debugging disabled where I click ok to enable it.

Then my sharepoint site opens, I log in and it displays my default team site page.
I go edit the page and add my custom web part, and when I click add I get a loading window that seems to hang for a while and then an error:

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