var image = System.Drawing.Image.FromFile(@"C:\1.png");
string base64String = String.Empty;
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
byte[] imageBytes = ms.ToArray();
base64String = Convert.ToBase64String(imageBytes);
}
var result = ZennoPoster.CaptchaRecognition("Anti-Captcha.dll", base64String, "");
var split = result.Split(new [] {"-|-"}, StringSplitOptions.RemoveEmptyEntries);
if (split.Length == 2) return split[0];
else throw new Exception("ERROR");