#region 实现一个验证码的类
public class ValidateCode
{
private Bitmap validateimage;
private Graphics g;
public ValidateCode()
{
validateimage = new Bitmap(120, 30, PixelFormat.Format24bppRgb);
g = Graphics.FromImage(validateimage);
}
public void DrawValidateCode(Page e, string i)
{
g.DrawString(i, new Font("黑体",16,FontStyle.Bold),new SolidBrush(Color.White),new PointF(2,4));
g.FillRectangle(new LinearGradientBrush(new Point(0,0), new Point(120,30), Color.FromArgb(0,0,0,0),Color.FromArgb(255,255,255,255)),0,0,120,30);
//validateimage.Save(e.OutputStream, ImageFormat.Jpeg);
g.Save();
MemoryStream ms=new MemoryStream();
validateimage.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
e.Response.ClearContent();
e.Response.ContentType="image/gif";
e.Response.BinaryWrite(ms.ToArray());
e.Response.End();
//validatei……
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