public FileResult GetBytes(string GUID)
{
Document doc = repos3.GetDocument(GUID);
byte[] mas = doc.Data;
string type = "";
for (int i = doc.Name.LastIndexOf('.'); i < doc.Name.Length; i++)
{
type += GUID[i];
}
string file_type = "application/" + type;
string file_name = doc.Name;
return(File(mas, file_type, file_name));
}