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protected object atualiza(string query)

    {

        string ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Dados.mdf;Integrated Security=True;User Instance=True";

        object obj;

        using (SqlConnection conn = new SqlConnection(ConnectionString))

        {

            SqlCommand cmd = new SqlCommand(query, conn);

            conn.Open();

            obj = cmd.ExecuteScalar();

        }

        return obj;

    }