public IActionResult Code()
{
var random = new Random();
var code = string.Empty;
for (int i = 0; i < 4; i++)
{
code += random.Next(0, 9);
}
HttpContext.Session.Set("VerificationCode", code);
byte[] buffer = UtilHelper.GenerateVerificationCode(code);
return(File(buffer, "image/png"));
}
