using System;

using System.Xml.Linq;          

using System.Xml.XPath;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var dsTexto = @"<?xml version='1.0' encoding='ISO-8859-1' ?><ProtocoloGIN><Evento>RetIntegRF</Evento><Data>10/10/2019</Data><Hora>13:26:39</Hora><NumInstitucional>2090032742</NumInstitucional><Status>1</Status><NumOpeCRK>0</NumOpeCRK><Erros><Erro><CodErro>79</CodErro><TagErro>CodCliente</TagErro><DsErro>ERRO: Nao encontrado Cliente Ativo com os dados fornecidos(2). Cod.Cliente=22977 CNPJ/CPF=7846130870 (90s)</DsErro></Erro><Erro><CodErro>79</CodErro><TagErro>CodCliente</TagErro><DsErro>ERRO: Cliente nao localizado. (90s)</DsErro></Erro><Erro><CodErro>3</CodErro><TagErro>NumContaCli</TagErro><DsErro>ERRO: Conta nao localizada. (90s)</DsErro></Erro><Erro><CodErro>1</CodErro><TagErro>DatOper</TagErro><DsErro>ERRO: Agendamento marcado para efetivar automaticamente. Empresa:3 DatOper: 10/10/2019 Data Sistema: 07/10/2019 IndEfetAut: S (90f)</DsErro></Erro></Erros></ProtocoloGIN> ";

        var doc = XDocument.Parse(dsTexto);

        var node = doc.XPathSelectElement("*/Erros");

        Console.WriteLine(node.ToString()); 

        var strEntrada = "<NomFantsPagdr>MAURICIO CONCEI[0xc3][0x87][0xc3][0x83]O LOSCHI BATISTA</NomFantsPagdr>";

        var str1 = TrocaAcentos(strEntrada,true);

        var str2 = TrocaAcentos(str1,false);

        Console.WriteLine(strEntrada);

;   }

    public static String TrocaAcentos(String vlrEntrada, bool bDeUTF8paraAscii)

    {

        var lst = new SortedList<String,String>()

        {

            {"0xc2 0xa1","¡"} ,     {"[0xc2][0xa1]","¡"} ,  {"[0XC2][0XA1]","¡"} , 

            {"0xc2 0xa2","¢"} ,     {"[0xc2][0xa2]","¢"} ,  {"[0XC2][0XA2]","¢"} , 

            {"0xc2 0xa3","£"} ,     {"[0xc2][0xa3]","£"} ,  {"[0XC2][0XA3]","£"} , 

            {"0xc2 0xa4","¤"} ,     {"[0xc2][0xa4]","¤"} ,  {"[0XC2][0XA4]","¤"} , 

            {"0xc2 0xa5","¥"} ,     {"[0xc2][0xa5]","¥"} ,  {"[0XC2][0XA5]","¥"} , 

            {"0xc2 0xa6","¦"} ,     {"[0xc2][0xa6]","¦"} ,  {"[0XC2][0XA6]","¦"} , 

            {"0xc2 0xa7","§"} ,     {"[0xc2][0xa7]","§"} ,  {"[0XC2][0XA7]","§"} , 

            {"0xc2 0xa8","¨"} ,     {"[0xc2][0xa8]","¨"} ,  {"[0XC2][0XA8]","¨"} , 

            {"0xc2 0xa9","©"} ,     {"[0xc2][0xa9]","©"} ,  {"[0XC2][0XA9]","©"} , 

            {"0xc2 0xaa","ª"} ,     {"[0xc2][0xaa]","ª"} ,  {"[0XC2][0XAA]","ª"} , 

            {"0xc2 0xab","«"} ,     {"[0xc2][0xab]","«"} ,  {"[0XC2][0XAB]","«"} , 

            {"0xc2 0xac","¬"} ,     {"[0xc2][0xac]","¬"} ,  {"[0XC2][0XAC]","¬"} , 

            {"0xc2 0xad","•"} ,     {"[0xc2][0xad]","•"} ,  {"[0XC2][0XAD]","•"} , 

            {"0xc2 0xae","®"} ,     {"[0xc2][0xae]","®"} ,  {"[0XC2][0XAE]","®"} , 

            {"0xc2 0xaf","¯"} ,     {"[0xc2][0xaf]","¯"} ,  {"[0XC2][0XAF]","¯"} , 

            {"0xc2 0xb0","°"} ,     {"[0xc2][0xb0]","°"} ,  {"[0XC2][0XB0]","°"} , 

            {"0xc2 0xb1","±"} ,     {"[0xc2][0xb1]","±"} ,  {"[0XC2][0XB1]","±"} , 

            {"0xc2 0xb2","²"} ,     {"[0xc2][0xb2]","²"} ,  {"[0XC2][0XB2]","²"} , 

            {"0xc2 0xb3","³"} ,     {"[0xc2][0xb3]","³"} ,  {"[0XC2][0XB3]","³"} , 

            {"0xc2 0xb4","´"} ,     {"[0xc2][0xb4]","´"} ,  {"[0XC2][0XB4]","´"} , 

            {"0xc2 0xb5","µ"} ,     {"[0xc2][0xb5]","µ"} ,  {"[0XC2][0XB5]","µ"} , 

            {"0xc2 0xb6","¶"} ,     {"[0xc2][0xb6]","¶"} ,  {"[0XC2][0XB6]","¶"} , 

            {"0xc2 0xb7","·"} ,     {"[0xc2][0xb7]","·"} ,  {"[0XC2][0XB7]","·"} , 

            {"0xc2 0xb8","¸"} ,     {"[0xc2][0xb8]","¸"} ,  {"[0XC2][0XB8]","¸"} , 

            {"0xc2 0xb9","¹"} ,     {"[0xc2][0xb9]","¹"} ,  {"[0XC2][0XB9]","¹"} , 

            {"0xc2 0xba","º"} ,     {"[0xc2][0xba]","º"} ,  {"[0XC2][0XBA]","º"} , 

            {"0xc2 0xbb","»"} ,     {"[0xc2][0xbb]","»"} ,  {"[0XC2][0XBB]","»"} , 

            {"0xc2 0xbc","¼"} ,     {"[0xc2][0xbc]","¼"} ,  {"[0XC2][0XBC]","¼"} , 

            {"0xc2 0xbd","½"} ,     {"[0xc2][0xbd]","½"} ,  {"[0XC2][0XBD]","½"} , 

            {"0xc2 0xbe","¾"} ,     {"[0xc2][0xbe]","¾"} ,  {"[0XC2][0XBE]","¾"} , 

            {"0xc2 0xbf","¿"} ,     {"[0xc2][0xbf]","¿"} ,  {"[0XC2][0XBF]","¿"} , 

            {"0xc3 0x80","À"} ,     {"[0xc3][0x80]","À"} ,  {"[0XC3][0X80]","À"} , 

            {"0xc3 0x81","Á"} ,     {"[0xc3][0x81]","Á"} ,  {"[0XC3][0X81]","Á"} , 

            {"0xc3 0x82","Â"} ,     {"[0xc3][0x82]","Â"} ,  {"[0XC3][0X82]","Â"} , 

            {"0xc3 0x83","Ã"} ,     {"[0xc3][0x83]","Ã"} ,  {"[0XC3][0X83]","Ã"} , 

            {"0xc3 0x84","Ä"} ,     {"[0xc3][0x84]","Ä"} ,  {"[0XC3][0X84]","Ä"} , 

            {"0xc3 0x85","Å"} ,     {"[0xc3][0x85]","Å"} ,  {"[0XC3][0X85]","Å"} , 

            {"0xc3 0x86","Æ"} ,     {"[0xc3][0x86]","Æ"} ,  {"[0XC3][0X86]","Æ"} , 

            {"0xc3 0x87","Ç"} ,     {"[0xc3][0x87]","Ç"} ,  {"[0XC3][0X87]","Ç"} , 

            {"0xc3 0x88","È"} ,     {"[0xc3][0x88]","È"} ,  {"[0XC3][0X88]","È"} , 

            {"0xc3 0x89","É"} ,     {"[0xc3][0x89]","É"} ,  {"[0XC3][0X89]","É"} , 

            {"0xc3 0x8a","Ê"} ,     {"[0xc3][0x8a]","Ê"} ,  {"[0XC3][0X8A]","Ê"} , 

            {"0xc3 0x8b","Ë"} ,     {"[0xc3][0x8b]","Ë"} ,  {"[0XC3][0X8B]","Ë"} , 

            {"0xc3 0x8c","Ì"} ,     {"[0xc3][0x8c]","Ì"} ,  {"[0XC3][0X8C]","Ì"} , 

            {"0xc3 0x8d","Í"} ,     {"[0xc3][0x8d]","Í"} ,  {"[0XC3][0X8D]","Í"} , 

            {"0xc3 0x8e","Î"} ,     {"[0xc3][0x8e]","Î"} ,  {"[0XC3][0X8E]","Î"} , 

            {"0xc3 0x8f","Ï"} ,     {"[0xc3][0x8f]","Ï"} ,  {"[0XC3][0X8F]","Ï"} , 

            {"0xc3 0x90","Ð"} ,     {"[0xc3][0x90]","Ð"} ,  {"[0XC3][0X90]","Ð"} , 

            {"0xc3 0x91","Ñ"} ,     {"[0xc3][0x91]","Ñ"} ,  {"[0XC3][0X91]","Ñ"} , 

            {"0xc3 0x92","Ò"} ,     {"[0xc3][0x92]","Ò"} ,  {"[0XC3][0X92]","Ò"} , 

            {"0xc3 0x93","Ó"} ,     {"[0xc3][0x93]","Ó"} ,  {"[0XC3][0X93]","Ó"} , 

            {"0xc3 0x94","Ô"} ,     {"[0xc3][0x94]","Ô"} ,  {"[0XC3][0X94]","Ô"} , 

            {"0xc3 0x95","Õ"} ,     {"[0xc3][0x95]","Õ"} ,  {"[0XC3][0X95]","Õ"} , 

            {"0xc3 0x96","Ö"} ,     {"[0xc3][0x96]","Ö"} ,  {"[0XC3][0X96]","Ö"} , 

            {"0xc3 0x97","×"} ,     {"[0xc3][0x97]","×"} ,  {"[0XC3][0X97]","×"} , 

            {"0xc3 0x98","Ø"} ,     {"[0xc3][0x98]","Ø"} ,  {"[0XC3][0X98]","Ø"} , 

            {"0xc3 0x99","Ù"} ,     {"[0xc3][0x99]","Ù"} ,  {"[0XC3][0X99]","Ù"} , 

            {"0xc3 0x9a","Ú"} ,     {"[0xc3][0x9a]","Ú"} ,  {"[0XC3][0X9A]","Ú"} , 

            {"0xc3 0x9b","Û"} ,     {"[0xc3][0x9b]","Û"} ,  {"[0XC3][0X9B]","Û"} , 

            {"0xc3 0x9c","Ü"} ,     {"[0xc3][0x9c]","Ü"} ,  {"[0XC3][0X9C]","Ü"} , 

            {"0xc3 0x9d","Ý"} ,     {"[0xc3][0x9d]","Ý"} ,  {"[0XC3][0X9D]","Ý"} , 

            {"0xc3 0x9e","Þ"} ,     {"[0xc3][0x9e]","Þ"} ,  {"[0XC3][0X9E]","Þ"} , 

            {"0xc3 0x9f","ß"} ,     {"[0xc3][0x9f]","ß"} ,  {"[0XC3][0X9F]","ß"} , 

            {"0xc3 0xa0","à"} ,     {"[0xc3][0xa0]","à"} ,  {"[0XC3][0XA0]","à"} , 

            {"0xc3 0xa1","á"} ,     {"[0xc3][0xa1]","á"} ,  {"[0XC3][0XA1]","á"} , 

            {"0xc3 0xa2","â"} ,     {"[0xc3][0xa2]","â"} ,  {"[0XC3][0XA2]","â"} , 

            {"0xc3 0xa3","ã"} ,     {"[0xc3][0xa3]","ã"} ,  {"[0XC3][0XA3]","ã"} , 

            {"0xc3 0xa4","ä"} ,     {"[0xc3][0xa4]","ä"} ,  {"[0XC3][0XA4]","ä"} , 

            {"0xc3 0xa5","å"} ,     {"[0xc3][0xa5]","å"} ,  {"[0XC3][0XA5]","å"} , 

            {"0xc3 0xa6","æ"} ,     {"[0xc3][0xa6]","æ"} ,  {"[0XC3][0XA6]","æ"} , 

            {"0xc3 0xa7","ç"} ,     {"[0xc3][0xa7]","ç"} ,  {"[0XC3][0XA7]","ç"} , 

            {"0xc3 0xa8","è"} ,     {"[0xc3][0xa8]","è"} ,  {"[0XC3][0XA8]","è"} , 

            {"0xc3 0xa9","é"} ,     {"[0xc3][0xa9]","é"} ,  {"[0XC3][0XA9]","é"} , 

            {"0xc3 0xaa","ê"} ,     {"[0xc3][0xaa]","ê"} ,  {"[0XC3][0XAA]","ê"} , 

            {"0xc3 0xab","ë"} ,     {"[0xc3][0xab]","ë"} ,  {"[0XC3][0XAB]","ë"} , 

            {"0xc3 0xac","ì"} ,     {"[0xc3][0xac]","ì"} ,  {"[0XC3][0XAC]","ì"} , 

            {"0xc3 0xad","í"} ,     {"[0xc3][0xad]","í"} ,  {"[0XC3][0XAD]","í"} , 

            {"0xc3 0xae","î"} ,     {"[0xc3][0xae]","î"} ,  {"[0XC3][0XAE]","î"} , 

            {"0xc3 0xaf","ï"} ,     {"[0xc3][0xaf]","ï"} ,  {"[0XC3][0XAF]","ï"} , 

            {"0xc3 0xb0","ð"} ,     {"[0xc3][0xb0]","ð"} ,  {"[0XC3][0XB0]","ð"} , 

            {"0xc3 0xb1","ñ"} ,     {"[0xc3][0xb1]","ñ"} ,  {"[0XC3][0XB1]","ñ"} , 

            {"0xc3 0xb2","ò"} ,     {"[0xc3][0xb2]","ò"} ,  {"[0XC3][0XB2]","ò"} , 

            {"0xc3 0xb3","ó"} ,     {"[0xc3][0xb3]","ó"} ,  {"[0XC3][0XB3]","ó"} , 

            {"0xc3 0xb4","ô"} ,     {"[0xc3][0xb4]","ô"} ,  {"[0XC3][0XB4]","ô"} , 

            {"0xc3 0xb5","õ"} ,     {"[0xc3][0xb5]","õ"} ,  {"[0XC3][0XB5]","õ"} , 

            {"0xc3 0xb6","ö"} ,     {"[0xc3][0xb6]","ö"} ,  {"[0XC3][0XB6]","ö"} , 

            {"0xc3 0xb7","÷"} ,     {"[0xc3][0xb7]","÷"} ,  {"[0XC3][0XB7]","÷"} , 

            {"0xc3 0xb8","ø"} ,     {"[0xc3][0xb8]","ø"} ,  {"[0XC3][0XB8]","ø"} , 

            {"0xc3 0xb9","ù"} ,     {"[0xc3][0xb9]","ù"} ,  {"[0XC3][0XB9]","ù"} , 

            {"0xc3 0xba","ú"} ,     {"[0xc3][0xba]","ú"} ,  {"[0XC3][0XBA]","ú"} , 

            {"0xc3 0xbb","û"} ,     {"[0xc3][0xbb]","û"} ,  {"[0XC3][0XBB]","û"} , 

            {"0xc3 0xbc","ü"} ,     {"[0xc3][0xbc]","ü"} ,  {"[0XC3][0XBC]","ü"} , 

            {"0xc3 0xbd","ý"} ,     {"[0xc3][0xbd]","ý"} ,  {"[0XC3][0XBD]","ý"} , 

            {"0xc3 0xbe","þ"} ,     {"[0xc3][0xbe]","þ"} ,  {"[0XC3][0XBE]","þ"} , 

            {"0xc3 0xbf","ÿ"} ,     {"[0xc3][0xbf]","ÿ"} ,  {"[0XC3][0XBF]","ÿ"} , 

​

        };

        foreach(var item in lst)

        {

            if (bDeUTF8paraAscii)

                vlrEntrada = vlrEntrada.Replace(item.Key,item.Value);

            else

                vlrEntrada = vlrEntrada.Replace(item.Value,item.Key);

        }   

        return vlrEntrada;

    }

}