This method sets the specified permission for the specified roles. The first parameter is used for setting the allow rights, the second for deny and the third is array of roles. If you want to grant View and Create and deny Delete you can use this code
sPage.SetPermissions(Telerik.Cms.Security.PageRights.View | Telerik.Cms.Security.PageRights.Create, Telerik.Cms.Security.PageRights.Delete, roles);
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