The verification code that I feel good (the code is not written by myself)

I feel the verification Code, verification code, not written by myself, I hereby release, please forgive the author
The class of the CAPTCHA code, placed under the App_Code folder
Using System;
Using System.Web;
Using System.IO;
Using System.Drawing;
/**/
<summary>
Summary description of the Verifycode.
</summary>
public class Verifycode
{
Properties

#region the length of the authentication code (the length of the default 4 Authenticode) #region The Verification code length (the length of the default 4 Authenticode)
int length = 4;
public int Length
{
get {return length;}
set {length = value;}
}
#endregion

#region Authenticode Font size (default 12 pixels) #region Authenticode font size (default 12 pixels)
int fontsize = 12;
public int FontSize
{
get {return fontsize;}
set {fontsize = value;}
}
#endregion

#region Border complement (default 2 pixels) #region Border complement (default 2 pixels)
int padding = 2;
public int Padding
{
get {return padding;}
set {padding = value;}
}
#endregion

#region whether to output dryness point (default does not output) #region output dryness point (default does not output)
BOOL chaos = false;
public bool Chaos
{
get {return chaos;}
set {chaos = value;}
}
#endregion

#region the color of the output dryness point (default gray) #region The color of the output dryness point (default gray)
Color chaoscolor = Color.lightgray;
Public Color Chaoscolor
{
get {return chaoscolor;}
set {Chaoscolor = value;}
}
#endregion

#region Custom background color (default white) #region Custom background color (default white)
Color backgroundcolor = Color.White;
Public Color BackgroundColor
{
get {return backgroundcolor;}
set {backgroundcolor = value;}
}
#endregion

#region custom Random color array #region custom random color array
color[] Colors = {color.black, color.red, Color.darkblue, Color.green, Color.orange, Color.brown, Color.darkcyan, Color . Purple};
Public color[] Colors
{
get {return colors;}
set {colors = value;}
}
#endregion

#region Custom font array #region custom font array
string [] fonts = {"Arial", "Georgia"};
public string [] Fonts
{
get {return fonts;}
set {fonts = value;}
}
#endregion

#region custom Random code string sequences (separated by commas) #region a sequence of custom random code strings (separated by commas)
String codeserial = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,a,b,c,d,e,f,g,h,i,j, K,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z ";
public string codeserial
{
get {return codeserial;}
set {codeserial = value;}
}
#endregion

#region Generate check code picture #region Generate check code picture
/**/
<summary>
Generate Check code picture
</summary>
<param name= "code" > already generated random code </param>
<returns> Bitmap </returns>
Public Bitmap Createimagecode (string code)
{
int fsize = fontsize;
int fwidth = fsize + Padding;

int imagewidth = (int) (code. Length * fwidth) + 4 + Padding * 2;
int imageheight = fsize * 2 + Padding;

System.Drawing.Bitmap image = New System.Drawing.Bitmap (imagewidth, imageheight);

Graphics g = graphics.fromimage (image);

G.clear (BackgroundColor);

Random rand = new Random ();

Add a randomly generated dryness point to the background
if (this. Chaos)
{

Pen pen = new Pen (chaoscolor, 0);
int c = Length * 10;

for (int i = 0; i < C; i + +)
{
int x = rand. Next (image. Width);
int y = rand. Next (image. Height);

G.drawrectangle (pen, x, Y, 1, 1);
}
}

int left = 0, top = 0, Top1 = 1, top2 = 1;

int n1 = (imageheight-fontsize-padding * 2);
int n2 = N1/4;
Top1 = n2;
Top2 = n2 * 2;

Font F;
Brush b;

int CIndex, Findex;

Validation code characters for random fonts and colors
for (int i = 0; i < code. Length; i + +)
{
CIndex = Rand. Next (colors.length-1);
Findex = Rand. Next (fonts.length-1);

f = new System.Drawing.Font (Fonts[findex], fsize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush (Colors[cindex]);

if (i% 2 = 1)
{
top = TOP2;
}