SQL clean all tables data

CleanAllTables.cs

 public void CleanAllTables()
        {
            var sql = $@"
EXEC [sys].[sp_MSforeachtable] 'ALTER TABLE ? NOCHECK CONSTRAINT all';
EXEC [sys].[sp_MSforeachtable] 'SET QUOTED_IDENTIFIER ON; DELETE FROM ?';
EXEC [sys].[sp_MSforeachtable] 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all';
";
            using (var conn = OpenConnection())
                conn.Connection.ExecuteNonQuery(sql);
        }