Save configuration and file format

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Hi misters,

I have an app.config (UTF-8 format file). I create an application winforms
for changes and save configuration programatically .

When I save changes the format file changes to ANSI :( but I need format
file UTF-8, and too when I open app.config and changed it, Visual Studio
save it like UTF-8.

Any suggestions or comments, please ? I need help about it

Thanks in advance. See code below please

My code is:

string rutaConfig= tbRutaConfigSer vicioIndexado.T ext;
// Map to the application configuration file.
ExeConfiguratio nFileMap configFile= New ExeConfiguratio nFileMap();
configFile.ExeC onfigFilename = rutaConfig;
Configuration config=
ConfigurationMa nager.OpenMappe dExeConfigurati on(configFile,
ConfigurationUs erLevel.None);

string[] keys = config.AppSetti ngs.Settings.Al lKeys;

KeyValueConfigu rationCollectio n settings1= config.AppSetti ngs.Settings();

settings1("PDF_ CREADOR").Value = tbServicioIndex adoPDF_CREADOR. Text;

config.Connecti onStrings.Conne ctionStrings["SQLConnect ion"].ConnectionStri ng
= tbCadenaConexio nFirmasParaServ icioIndexado.Te xt;

//' Modifica el app.config pero pierde los comentarios del appsettings
config.Save(Con figurationSaveM ode.Modified);


ServiceModelSec tionGroup sectionGroup =
ServiceModelSec tionGroup.GetSe ctionGroup(conf ig);

ChannelEndpoint ElementCollecti on listaEndpoints =
sectionGroup.Cl ient.Endpoints;

if (listaEndpoints .Count >= 2)
{
ChannelEndpoint Element endpoint = null;
ChannelEndpoint Element endpoint2 = null;

// Endpoint Agente Servicio Base
endpoint = BuscarEndpointC lientePorNombre (listaEndpoints ,
"AgenteServicio Base");
endpoint.Addres s = new Uri(endpointAge nteServicioBase );

// Endpoint Agente Log
endpoint2 = BuscarEndpointC lientePorNombre (listaEndpoints ,
"AgenteLog" );
endpoint2.Addre ss = new Uri(endpointAge nteLog);

}


config.Save(Con figurationSaveM ode.Modified);

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