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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 )]);
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string text = myStr.ToString();
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Size ImageSize = Size.Empty ;
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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 ;
    }
}
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{
    // »æÖÆÑéÖ¤ÂëÎı¾
    using( Graphics g = Graphics.fromImage( bmp ))
    {
        g.Clear( Color.White );
        using( StringFormat f = new StringFormat())
        {
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