原文地址：http://www.cnblogs.com/xcsn/p/4514759.html
引用BarcodeLib.dll（百度云中有）生成条形 protected void Button2_Click(object sender, EventArgs e)//点击button2，生成条形码。
{
System.Drawing.Image image;
int width = , height = ;
string fileSavePath = AppDomain.CurrentDomain.BaseDirectory + "BarcodePattern.jpg";
if (File.Exists(fileSavePath))
File.Delete(fileSavePath);
GetBarcode(height, width, BarcodeLib.TYPE.CODE128, "20131025-136", out image, fileSavePath);
//"20131025-136"是条形码的内容，fileSavePath是条形码保存的位置。
}
public static void GetBarcode(int height, int width, BarcodeLib.TYPE type, string code, out System.Drawing.Image image, string fileSaveUrl)
{
image = null;
BarcodeLib.Barcode b = new BarcodeLib.Barcode();
b.BackColor = System.Drawing.Color.White;
b.ForeColor = System.Drawing.Color.Black;
b.IncludeLabel = true;
b.Alignment = BarcodeLib.AlignmentPositions.CENTER;
b.LabelPosition = BarcodeLib.LabelPositions.BOTTOMCENTER;
b.ImageFormat = System.Drawing.Imaging.ImageFormat.Jpeg;
System.Drawing.Font font = new System.Drawing.Font("verdana", 10f);
b.LabelFont = font;
b.Height = height;
b.Width = width;
image = b.Encode(type, code);
image.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Png);
}