This post shows you how to retrieve a checkboxlist from a multi choice field as well as how to update the field using SPFieldMultiChoiceValue.
Aaron was creating a custom web service to be used by web parts in Sharepoint, but then there was a problem of a giant list of "undefined" values returning. Done a lot of research and later this brilliant post directed us to the right place.
I wanted to use Ajax control toolkit in Sharepoint, and had not had any luck until I spent the whole day debugging and getting it to work. I already had Ajax integrated in Sharepoint, so it should be fairly easy to just add in AjaxControlToolkit, but the problem is the latest version of it actually requires you to use ToolkitScriptManager instead of ScriptManager, otherwise your control will not work and you will see a Javascript error of "Please wait while scripts are loaded".
I had to create a task dynamically in C# and assign the task to a reviewer, which is a user account. However, there was this problem of the "Assigned to" field is only read only. To do that, just create an SPFieldUserValueCollection and assign it to task item.
I needed to get SPUser object from doing a lookup using CAML query, so that I could get the user information such as email address, etc. To do that, this is the code that I used: