public static SqlBinary MergePHkeys(SqlBinary oldPHkeys, SqlInt16 newSnap, SqlInt32 newPHkey)
 {
     SqlIntArray keyArray = new SqlIntArray(oldPHkeys);
     int[] keys = keyArray.ToArray();
     keys[(short) newSnap] = (int) newPHkey;
     return SqlIntArray.FromArray(keys).ToSqlBuffer();
 }