c# - Text.Encoding.Default.GetBytes() / Encoding.Default.GetString() / Xamarin -

i have programmed server , client application under xamarin c# (for pc , android phone).

now have problem umlauts (äöüÄÖÜ) @ text.encoding.default.getbytes () / encoding.default.getstring ().

if server , client running on pc, umlauts converted correctly. when operated smartphone , pc question marks issued on conversion of umlauts. other data converted properly.

where problem?

    private void cbuttonsend_click(object sender, eventargs e)     {         try         {             if (caktiveclient == "") toast.maketext(this, "wählen sie einen client aus!", toastlength.long).show();             else             {                 string txt = csendetext.text;                 byte[] telegramm = new byte[txt.length];                 telegramm = system.text.encoding.default.getbytes(txt);                  foreach (tcpclient c in cserver.clientlist)                 {                     if (c.client.remoteendpoint.tostring() == caktiveclient) cserver.send(c, telegramm);                 }                 csendetext.text = "";             }         }         catch (exception ex)         {             toast.maketext(this, ex.message, toastlength.short).show();         }     }       private void cserver_recieve(object sender, eventargs e)     {         // bei aufrufen aus anderenthreads         this.runonuithread(() =>         {             try             {                 tcpip_multiserver t = sender tcpip_multiserver;                 cempfangsclient.text = t.nowclient.client.remoteendpoint.tostring();                 cempfangstext.text = encoding.default.getstring(cserver.buffer, 0, cserver.recievedbytes);             }             catch (exception ex)             {                 toast.maketext(this, ex.message, toastlength.long).show();             }         });     } 

to reduce size of application, xamarin doesn't include specific encodings.

read this: https://developer.xamarin.com/guides/ios/advanced_topics/localization_and_internationalization/encodings/ (on android it's same)

and this: https://developer.xamarin.com/guides/cross-platform/xamarin-forms/localization/