Database.SetOwner Method (String)
Sets the database owner.
Assembly: Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)
You can set the database owner to a server login account. If the specified login is already a user in the database, you must either remove it first, or use the SetOwner overload and set the overrideIfAleadyUser parameter to True.
'Connect to the local, default instance of SQL Server. Dim srv As Server srv = New Server 'Reference the AdventureWorks database. Dim db As Database db = srv.Databases("AdventureWorks") 'Set the owner to a valid logon. When True, the second 'parameter will override if the proposed login is 'already defined as a user on the database. db.SetOwner(lstr, True)