string ss = "abcdefg";
　　char[] cc = ss.ToCharArray();

string s = new string(cc);

　　byte[] bb = Encoding.UTF8.GetBytes(ss);
　　string s = Encoding.UTF8.GetString(bb);

string strOr = "OR";
string result = string.Concat(new string[]{" A ",strOr," B ",Environment.NewLine," C ",strOr," D "});

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