Set Item Level Permission for SharePoint 2007 (MOSS/WSS) List/Document Library Programmatically

Here is a piece of code (a function) to set Item Level Permission. You can use it as a Web Method in a custom Web Service. This method can be used from Applications outside of SharePoint, provided the user using this application has sufficient privilege to update lists/libraries etc.

public string ItemPermission(string SitePath)


string ReturnVal = “”;



SPSite WebApp = new SPSite(SitePath);

SPWeb Site = WebApp.OpenWeb();

SPList list = Site.Lists[“TestDocLib”];

SPListItem item = list.Items[0];

SPRoleDefinition RoleDefinition = Site.RoleDefinitions.GetByType(SPRoleType.Contributor);

SPRoleAssignment RoleAssignment = new SPRoleAssignment(“<domain>\\<user>”, “email”, “name”, “notes”);









catch (Exception ex)


ReturnVal += “Permission not set, reason: ” + ex.Message;


return ReturnVal;


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