send byte array by HTTP POST in store app

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It will be more straightforward to use System.Net.Http.ByteArrayContent. E.g:

// Converting byte[] into System.Net.Http.HttpContent.
byte[] data = new byte[] { 1, 2, 3, 4, 5};
ByteArrayContent byteContent = new ByteArrayContent(data);
HttpResponseMessage response = await client.PostAsync(uri, byteContent);

For text only with an specific text encoding use:

// Convert string into System.Net.Http.HttpContent using UTF-8 encoding.
StringContent stringContent = new StringContent(
    "blah blah",
    System.Text.Encoding.UTF8);
HttpResponseMessage response = await client.PostAsync(uri, stringContent);

Or as you mentioned above, for text and images using multipart/form-data:

// Send binary data and string data in a single request.
MultipartFormDataContent multipartContent = new MultipartFormDataContent();
multipartContent.Add(byteContent);
multipartContent.Add(stringContent);
HttpResponseMessage response = await client.PostAsync(uri, multipartContent);

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