public sealed class Code39 
{ 
#region private variables 
/// <summary> 
/// The Space Between each of Title, BarCode, BarCodeString 
/// </summary> 
private const int SPACE_HEIGHT = 3; 
SizeF _sizeLabel = SizeF.Empty; 
SizeF _sizeBarCodeValue = SizeF.Empty; 
SizeF _sizeBarCodeString = SizeF.Empty; 
#endregion 
#region Label 
private string _label = null; 
private Font _labelFont = null; 
/// <summary> 
/// BarCode Title (條碼標簽) 
/// </summary> 
public string Label 
{ 
set { _label = value; } 
} 
/// <summary> 
/// BarCode Title Font (條碼標簽使用的字體) 
/// </summary> 
public Font LabelFont 
{ 
get 
{ 
if (_labelFont == null) 
return new Font("Arial", 10); 
return _labelFont; 
} 
set { _labelFont = value; } 
} 
#endregion 
private string _additionalInfo = null; 
private Font _addtionalInfoFont = null; 
/// <summary> 
/// Additional Info Font (附加信息字體) 
/// </summary> 
public Font AdditionalInfoFont 
{ 
set { _addtionalInfoFont = value; } 
get 
{ 
if (_addtionalInfoFont == null) return new Font("Arial", 10); 
return _addtionalInfoFont; 
} 
} 
/// <summary> 
/// Additional Info Content, if "ShowBarCodeValue" is true, the info is unvisible 
/// 附加信息，如果設置ShowBarCodeValue為true,則此項不顯示 
/// </summary> 
public string AdditionalInfo 
{ 
set { _additionalInfo = value; } 
} 
#region BarCode Value and Font 
private string _barCodeValue = null; 
/// <summary> 
/// BarCode Value (條碼值) 
/// </summary> 
public string BarCodeValue 
{ 
get 
{ 
if (string.IsNullOrEmpty(_barCodeValue)) 
throw new NullReferenceException("The BarCodeValue has not been set yet!"); 
return _barCodeValue; 
} 
set { _barCodeValue = value.StartsWith("*") && value.EndsWith("*") ? value : "*" + value + "*"; } 
} 
private bool _showBarCodeValue = false; 
/// <summary> 
/// whether to show the original string of barcode value bellow the barcode 
/// 是否在條碼下方顯示條碼值，默認為false 
/// </summary> 
public bool ShowBarCodeValue 
{ 
set { _showBarCodeValue = value; } 
} 
private Font _barCodeValueFont = null; 
/// <summary> 
/// the font of the codestring to show 
/// 條碼下方顯示的條碼值的字體 
/// </summary> 
public Font BarCodeValueFont 
{ 
get 
{ 
if (_barCodeValueFont == null) 
return new Font("Arial", 10); 
return _barCodeValueFont; 
} 
set { _barCodeValueFont = value; } 
} 
private int _barCodeFontSize = 50; 
/// <summary> 
/// the font size of the barcode value to draw 
/// 條碼繪制的大小，默認50 
/// </summary> 
public int BarCodeFontSzie 
{ 
set { _barCodeFontSize = value; } 
} 
#endregion 
#region generate the barcode image 
private Bitmap BlankBackImage 
{ 
get 
{ 
int barCodeWidth = 0, barCodeHeight = 0; 
using (Bitmap bmp = new Bitmap(1, 1, PixelFormat.Format32bppArgb)) 
{ 
using (Graphics g = Graphics.FromImage(bmp)) 
{ 
if (!string.IsNullOrEmpty(_label)) 
{ 
_sizeLabel = g.MeasureString(_label, LabelFont); 
barCodeWidth = (int)_sizeLabel.Width; 
barCodeHeight = (int)_sizeLabel.Height + SPACE_HEIGHT; 
} 
_sizeBarCodeValue = g.MeasureString(BarCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize)); 
barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeValue.Width); 
barCodeHeight += (int)_sizeBarCodeValue.Height; 
if (_showBarCodeValue) 
{ 
_sizeBarCodeString = g.MeasureString(_barCodeValue, BarCodeValueFont); 
barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeString.Width); 
barCodeHeight += (int)_sizeBarCodeString.Height + SPACE_HEIGHT; 
} 
//else 
//{ 
// if (!string.IsNullOrEmpty(_additionalInfo)) 
// { 
// _sizeAdditionalInfo = g.MeasureString(_additionalInfo, AdditionalInfoFont); 
// barCodeWidth = Math.Max(barCodeWidth, (int)_sizeAdditionalInfo.Width); 
// barCodeHeight += (int)_sizeAdditionalInfo.Height + SPACE_HEIGHT; 
// } 
//} 
} 
} 
return new Bitmap(barCodeWidth, barCodeHeight, PixelFormat.Format32bppArgb); 
} 
} 
/// <summary> 
/// Draw the barcode value to the blank back image and output it to the browser 
/// 繪制WebForm形式的條碼 
/// </summary> 
/// <param name="ms">Recommand the "Response.OutputStream" 使用 Response.OutputStream</param> 
/// <param name="imageFormat">The Image format to the Browser