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System.Random rand = new Random();
int len = rand.Next(4 , 6 );
char[] chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
System.Text.StringBuilder myStr = new System.Text.StringBuilder();
for( int iCount = 0 ; iCount < len ; iCount ++ )
{
    myStr.Append( chars[ rand.Next( chars.Length )]);
}
string text = myStr.ToString();
// ±£´æÑéÖ¤Âëµ½ session ÖÐÒÔ±ãÆäËûÄ£¿éʹÓÃ
this.Session["checkcode"] = text ;
Size ImageSize = Size.Empty ;
Font myFont = new Font("MS Sans Serif" , 20 );
// ¼ÆËãÑéÖ¤ÂëͼƬ´óС
using( Bitmap bmp = new Bitmap( 10 , 10 ))
{
    using( Graphics g = Graphics.fromImage( bmp ))
    {
        SizeF size = g.MeasureString( text , myFont , 10000 );
        ImageSize.Width = ( int ) size.Width + 8 ;
        ImageSize.Height = ( int ) size.Height + 8 ;
    }
}
// ´´½¨ÑéÖ¤ÂëͼƬ
using( Bitmap bmp = new Bitmap( ImageSize.Width , ImageSize.Height ))
{
    // »æÖÆÑéÖ¤ÂëÎı¾
    using( Graphics g = Graphics.fromImage( bmp ))
    {
        g.Clear( Color.White );
        using( StringFormat f = new StringFormat())
        {
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