img <-> str

string   ToString(string   path)
{
FileStream   fs   =   new   FileStream(path,   FileMode.Open);
byte[]   buf   =   new   byte[fs.Length];
fs.Read(buf,   0,   (int)fs.Length);
string   s   =   Convert.ToBase64String(buf);
fs.Close();
return   s;
}
Image   ToImage(string   s)
{
byte[]   buf   =   Convert.FromBase64String(s);
MemoryStream   ms   =   new   MemoryStream(buf);
Image   img   =   Image.FromStream(ms);
return   img;
}