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How to create SPUser obj or SPRoleAssignment using the user display name not using login name "domai

Posted By:      Posted Date: September 03, 2010    Points: 0   Category :SharePoint
Suppose there is a user called "Jake Gittes" with login name "domain\jakeg". Now I want to create either SPUser/SPRoleAssignment object using the user full name ("Jake Gittes"). I tried using SPWeb.AllUsers["Jake Gittes"]. But it is throwing exception.

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