I have a LightSwitch application that needs to implement a lightweight task management system. Something where a Manager could come in and create a task and then assign it to someone else. While I can do the query to find tasks created by the logged in user (see this blog on MSDN) it doesn't fully answer my question.
How can I get the current list of registered users (the ones that the SysAdmin adds using the Form Auth selection and adds them in the Administration screen) in a drop down list and then 'assign' tasks to them?
You can use Membership.GetAllUsers() in your server project. You'll need to reference System.Web.Security to get access to it. This article talks about doing it in a WCF RIA Service but Generic File Handlers also work.
Alternatively, if you want to filter the list of users by what permissions they have, you can use a LINQ query on this.DataWorkspace.SecurityData.Permissions. This forum post goes into a little more detail on constructing a possible query for specific users.