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SendGrid inbound parse nordic chars

Completely stuck on a problem related to the inbound parse webhook functionality offered by SendGrid: https://sendgrid.com/docs/for-developers/parsing-email/setting-up-the-inbound-parse-webhook/
First off everything is working just fine with retrieving the mail sent to my application endpoint. Using Request.Form I'm able to retrieve the data and work with it.
The problem is that we started noticing question mark symbols instead of letters when recieving some mails (written in swedish using Å Ä and Ö). This occured both when sending plaintext mails, and mails with an HTML-body.
However, this only happens every now and then. After a lot of searching I found out that if the mail is sent from e.g. Postbox or Outlook (or the like), and the application has the charset set to iso-8859-1 that's when Å Ä Ö is replaced by question marks.
To replicate the error and be able to debug it I set up a HTML page with a form using the iso-8859-1 encoding, sending a similar payload as the one seen in the link above (the default one). And after that been through testing a multitude of things trying to get it to work.
As of now I'm trying to recode the input, without success. Code I'm testing:
Encoding wind1252 = Encoding.GetEncoding(1252);
Encoding utf8 = Encoding.UTF8;
byte[] wind1252Bytes = wind1252.GetBytes(Request.Form.["html"]);
byte[] utf8Bytes = Encoding.Convert(wind1252, utf8,wind1252Bytes);
string utf8String = Encoding.UTF8.GetString(utf8Bytes);
This only results in the utf8String producing the same result with "???" where Å Ä Ö should be. My guess here is that perhaps it's due to the Request.Form["html"] returning a UTF-16 string, of the content that is encoded already in the wrong encoding iso-8859-1.
The method for fetching the POST is as follows
public async Task<InboundParseModel> FetchMail(IFormCollection form)
{
InboundParseModel _em = new InboundParseModel
{
To = form["to"].SingleOrDefault(),
From = form["from"].SingleOrDefault(),
Subject = form["subject"].SingleOrDefault(),
Html = form["html"].SingleOrDefault(),
Text = System.Net.WebUtility.HtmlEncode(form["text"].SingleOrDefault()),
Envelope = form["envelope"].SingleOrDefault()
};
}
Called from another method that the POST is done to by FetchMail(Request.Form);
Project info: ASP.NET Core 2.2, C#
So as stated earlier, I am completely stuck and don't really have any ideas on how to solve this. Any help would be much appreciated!

C# : Change String Encoding?

I'm struggling with the encoding of one of my string.
On a Mail Sending WS, I'm receiving a bad string containing "�" instead of "é" (that's what I'm seeing in the Debug Mode of Visual Studio at least).
The character comes from some JSON that is deserialized when entering the WS into my DTO.
Changing the Content-Type of the JSON is not solving the thing.
So I thought I'll change the encoding of my string by myself, because the JSON encoding thing seems like a VS deserialization issue (I started a thread here if one of you guys want to take a look at it).
I tried :
Encoding iso = Encoding.GetEncoding("ISO-8859-1");
Encoding defaultEncoding = Encoding.Default;
byte[] bytes = defaultEncoding.GetBytes(messedUpString);
byte[] isoBytes = Encoding.Convert(defaultEncoding, iso, bytes);
cleanString = iso.GetString(isoBytes);
Or :
byte[] bytes = Encoding.Default.GetBytes(messedUpString);
cleanString = Encoding.UTF8.GetString(bytes);
And it's not really effective... I get rid of the "�" char, which is the nice part, but I'm receiving in the cleanString "?" instead of the expected "é", and this in not really nice, or at least, the expected behavior.

In fact, every thing was fine in my application.
I used SOAPUI to test, and this was my error.
I downloaded some rest plugin for my browser, try from there, and everything worked.
Thanks for the help though #MattiVirkkunen

Sending quotation marks in a GCM Payload (and other special characters that break syntax)

I'm struggling finding a feasible solution to this. I've tried looking around but can't find any documentation regarding this issue. If a customer sends out a message with quote(s), it break the payload syntax and android spits me back a 400 Bad Request error.
The only solution I can think of is by doing my own translations and validations. Allow only the basics, and for the restricted do my own "parsing" Ie take a quote, replace them with "/q" and then replace "/q" on the App when received. I don't like this solution because it involves logic on the App that if, I forget something. I want to be able to change it immediately rather then update everyones phone, app, etc.
I'm looking for an existing encoding I could apply that is processed correctly by the GCM servers. Allowing them to be accepted then broadcasted. Received by the phone with the characters intact.

Base64 encoding should get rid of the special characters. Just encode it before sending and decode it again on receiving:
Edit: sorry, just got a java/android sample here, I don't know how exactly xamarin works and what functions it provides:
// before sending
byte[] data = message.getBytes("UTF-8");
String base64Message = Base64.encodeToString(data, Base64.DEFAULT);
// on receiving
byte[] data = Base64.decode(base64Message , Base64.DEFAULT);
String message= new String(data, "UTF-8");

.Net translation of #tknell solution
Decode:
Byte[] data = System.Convert.FromBase64String(encodedString);
String decoded = System.Text.Encoding.UTF8.GetString(data);
Encode:
Byte[] data = System.Text.Encoding.UTF8.GetBytes(decodedString);
String encoded = System.Convert.ToBase64String(data);

C# display XML from html POST

Got a problem here... If I put the XML file on the server, then I can read it through steamReader, convert to variable and got everything working in the MSSQL database.
However, it is required that I send through html POST, and it doesn't work for the code below:
page.Response.ContentType = "text/xml";
StreamReader reader = new StreamReader(page.Request.InputStream);
inputString = reader.ReadToEnd();
deleteShip(inputString);
it seems to me that the above code didn't get the XML that POST from my program. Because for the same code in deleteShip, if I use an xml on the server then it works fine.
Is there a way to solve this problem? As long as I can send any string to deleteShip(string s) then I'm happy. The string will be in XML format though
Thanks for the help!

It would be useful to see how the XML is POSTed to your program. Typically, data is sent from an HTML form as name-value pairs in the HTTP request body when using the POST method. It's not clear from your question whether you're using an HTML form to POST the XML to your program and it's hard to tell what might be going wrong without more information.
From your code it looks like you're reading the entire HTTP request where you'd usually read the value of a request parameter for example:
Request["XmlParameterName"]
Where XmlParameterName is the name of an HTML form input field.
Have you inspected the value of the inputString variable? Is it valid XML? Is it encoded correctly? Are any invalid characters like ampersands (&) escaped correctly?
Update your question with a bit more information if none of the things I mentioned are the problem.

OK, I got it fixed.
Here is the code.
System.IO.Stream stream;
string inputString;
Int32 stringLength;
stream = Request.InputStream;
stringLength = Convert.ToInt32(stream.Length);
byte[] stringArray = new byte[stringLength];
inputString = System.Text.Encoding.ASCII.GetString(stringArray, 0, stringLength);
deleteShip(inputString);
By this it will access the POST body from my html request (which in this case XML).

C# - Korean Encoding

This might be different with other Korean encoding questions.
There is this site I have to scrape and it's Korean.
An example sentence in their site is this
"개인정보보호를 위해 뒤로가기 버튼 대신 검색결과 화면 상단과 하단의 이전 버튼을 사용하시기 바랍니다."
I am using HttpWebRequest and HttpWebResponse to scrape the site.
this is how I retreive the html
-- partial code --
using (Stream data = resp.GetResponseStream())
{
response.Append(new StreamReader(data, Encoding.GetEncoding(code), true).ReadToEnd());
}
now my problem is, am not getting the correct Korean characters. In my "code" variable, I'm basing the code page here in MSDN http://msdn.microsoft.com/en-us/library/system.text.encoding.aspx (let me narrow it down).
here are the Korean code pages:
51949, 50225, 20949, 20833, 10003, 949
but am still not getting the correct Korean characters? What you think is the problem?

It is very likely that the page is not in a specific Korean encoding, but one of the Unicode encodings.
Try Encoding.UTF8, Encoding.Default (UTF-16) instead of the specific code pages. There are also Encoding.UTF7 and Encoding.UTF32, but they are not as common.
To be certain, examine the meta tags and headers for the content-type returned by the server.
Update (gleaned from commments):
Since the content-type header is EUC-KR, the corresponding codepage is 51949 and this is what you need to use to retrieve the page.
It was not clear that you are writing this out to a file - you need to use the same encoding when writing the file out, or convert the byte[] from the original to the output file encoding (using Encoding.Convert).

While having exact same issue I've finished it with code below:
Encoding.UTF8.GetString(DownloadData(URL));
This directly transform output for the WebClient GET request to UTF8 encoding.