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Problem with image file attachment to note using SDK

I have an asp.net mvc app that connects to CRM to attach notes. Here is the code I use to attache file:

//File is of type HttpPostedFileType

byte[] file = new byte[File.ContentLength];
File.InputStream.Read(file, 0, file.Length);
var mimetype=File.ContentType;

Entity objNewEntity = new Entity("annotation");
objNewEntity["subject"] = title;
objNewEntity["objectid"] = new EntityReference(entitiyname, id);
objNewEntity["objecttypecode"] = entitiyname;
objNewEntity["documentbody"] = Convert.ToBase64String(file);
objNewEntity["filename"] = filename;
objNewEntity["mimetype"] = mimetype;

service.Create(objNewEntity);

and here is how I read the attachment :

model.Attachment = Convert.FromBase64String(annotation.Attributes["documentbody"].ToString());
model.FileName = annotation.Attributes["filename"].ToString();
model.MimeType = annotation.Attributes["mimetype"].ToString();

It saves all file, but when I download the file, only TXT file types are shown and png or jpg file are not shown in windows. I mean the file have size, but when I open it, windows 10 shows "We Can not open this file"

Would you help me please ?

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