createimage.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.IO;
using UserControl;
using System.Drawing;
public partial class Images_CreateImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //将获取的图片中放到流中
        MemoryStream mem = new MemoryStream();

        UValidate vd = new UValidate();
        vd = UCreateValidate.CreateValidateImage(4);

        
        string imageCode = vd.Code;

        //保存到Session中
        Session["imageCode"] = imageCode;
        Bitmap image = vd.ValidateImage;

        image.Save(mem, System.Drawing.Imaging.ImageFormat.Jpeg);
        Response.ClearContent();

        Response.ContentType = "image/Jpeg";

        Response.BinaryWrite(mem.ToArray());
    }
}