string fullFilePath = $@"\\блаблаблабла\{fileName}";
using (var fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
using (var ms = new MemoryStream())
                {
                    fs.CopyTo(ms);
                    ms.Position = 0;
                    Scan = Image.FromStream(ms);
                }

string fullFilePath = string.Format(@"~\Images\Scans\{0}", fileName);
using (var fs = new FileStream(fullFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
using (var ms = new MemoryStream())
                {
                    fs.CopyTo(ms);
                    ms.Position = 0;
                    Scan = Image.FromStream(ms);
                }

string str = SecuritySystem.CurrentUser.ToString();
string str1 = Environment.UserName;
string str2 = System.Security.Principal.WindowsIdentity.GetCurrent().Name;

using (var fs = new FileStream(System.Web.HttpContext.Current.Server.MapPath(fullFilePath), FileMode.Open, FileAccess.Read, FileShare.Read))