protected void Page_Load(object sender, EventArgs e) { string codeType = Request["code"]; if (string.IsNullOrEmpty(codeType as string)) { codeType = "123"; } ValidateCodeImg vCodeImg = new ValidateCodeImg(); string verifyCode = vCodeImg.CreateVerifyCode(codeType, 6, 0); Session["ImgCode"] = verifyCode; System.Drawing.Bitmap bitmap = vCodeImg.CreateImage(verifyCode, false); System.IO.MemoryStream ms = new System.IO.MemoryStream(); bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.Clear(); Response.ContentType = "image/Png"; Response.BinaryWrite(ms.GetBuffer()); bitmap.Dispose(); ms.Dispose(); ms.Close(); Response.End(); }