asp.net 验证码

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Drawing;
/// <summary>
///VerifyImage 的摘要说明
/// </summary>
public class VerifyImage
{
    public VerifyImage()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }

    #region 验证码长度(默认6个验证码的长度)
    int length = 4;
    public int Length
    {
        get { return length; }
        set { length = value; }
    }
    #endregion

    #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)
    int fontSize = 30;
    public int FontSize
    {
        get { return fontSize; }
        set { fontSize = value; }
    }
    #endregion

    #region 边框补(默认1像素)
    int padding = 2;
    public int Padding
    {
        get { return padding; }
        set { padding = value; }
    }
    #endregion

    #region 是否输出燥点(默认不输出)
    bool chaos = true;
    public bool Chaos
    {
        get { return chaos; }
        set { chaos = value; }
    }
    #endregion

    #region 输出燥点的颜色(默认灰色)
    Color chaosColor = Color.LightGray;