FBA roles and SPRoleAssignment

SPRoleDefinition spRole = elevatedWeb.RoleDefinitions["Read"];
SPRoleAssignment roleAssignment = new SPRoleAssignment("c:0-.f|roleprovidername|rolename", null, "rolename", null);
roleAssignment.RoleDefinitionBindings.Add(spRole);
Item.RoleAssignments.Add(roleAssignment);
Item.Update();

SPRoleDefinition spRole = elevatedWeb.RoleDefinitions["Read"]; SPRoleAssignment roleAssignment = new SPRoleAssignment("c:0-.f|roleprovidername|rolename", null, "rolename", null); roleAssignment.RoleDefinitionBindings.Add(spRole); Item.RoleAssignments.Add(roleAssignment); Item.Update();