Which Visualstudio project templates deploy in SharePoint2010sandbox solutions?

Project Templates

Name	Available for sandboxed solutions
Empty SharePoint Project	Yes.
Visual Web Part	No. Visual Web Part template uses a user control (.ascx file) and must be deployed as a farm solution.
Sequential Workflow	No. Programmatic workflows are not available for sandboxed solutions.
State Machine Workflow	No. Programmatic workflows are not available for sandboxed solutions.
Business Data Connectivity Model	No. BDC models is deployed at farm level and are therefore not available.
Event Receiver	Yes.
List Definition	Yes.
Content Type	Yes.
Module	Yes.
Site Definition	No. Site definitions is deployed at farm level and are not available.
Import Reusable Workflow	No. Programmatic workflows are not available for sandboxed solutions.
Import SharePoint Solution Package	Yes, if the items that is imported from the package are supported.

SharePoint Project Items

Name	Available for sandboxed solutions
Visual Web Part	No. Visual Web Part template uses a user control (.ascx file) and are not available for sandboxed solutions.
Web Part	Yes.
Sequential Workflow	No. Programmatic workflows are not available for sandboxed solutions.
State Machine Workflow	No. Programmatic workflows are not available for sandboxed solutions.
Workflow Association Form	No. Association forms includes .aspx files and are not available for sandboxed solutions.
Workflow Initiation Form	No. Initiation forms includes .aspx files and are not available for sandboxed solutions.
Business Data Connectivity Model	No. BDC models is deployed at farm level and are therefore not available.
Application Page	No. Application pages includes .aspx files and are not available for sandboxed solutions. Nothing under the Layouts folder can be deployed in sandboxed solutions.
Event Receiver	Yes.
Module	Yes.
Content Type	Yes.
List Definition From Content Type	Yes.
List Definition	Yes.
List Instance	Yes.
Empty Element	Yes.
User Control	No. User controls includes .ascx files and are not available for sandboxed solutions. Nothing under the ControlTemplates folder can be deployed in sandboxed solutions.