In SharePoint 2010 you get an ability to set item level permissions on items in a list or library, here is how UI in Advanced Settings of the list looks like:
If you’re defining your site through a schema or definition you probably want to know how all of those settings are set through the code, and here’s how:
First, the Read Access option is toggled Read all items or Read items that were … to set that you will write something like this:
SPList list = SPContext.Current.Web.Lists["MyList"];
list.ReadSecurity = 1;
The value of ReadSecurity will be either 1 or 2 as per msdn article.
Now the second option that will determine permissions to edit items will look somethig like this:
SPList list = SPContext.Current.Web.Lists["MyList"];
list.WriteSecurity= 1;
Here the value will be 1, 2 or 4 depending on the option that you can check out here at msdn.
Very usefull two options that back in MOSS days I had to write event receiver for, now available out of the box!
