I am trying my best to make an barcode image on the web site. It is like coupon and users could scan for the discount information and also it contains our web URL. I choose QR Code and write some vb codes below:

qrcode.Symbology = Aspper.Barcode.Symbology.QRCode
qrcode.CodeToEncode = "WWW.Aspper.com.30% off"
qrcode.X = 4
qrcode.Y = 4
qrcode.ImageFormat = System.Drawing.Imaging.ImageFormat.Png
qrcode.generateBarcodeToImageFile("C://QRCode.gif")

I did not see the barcode yet, please help me. I install the component on VS 2008 and drag and drop it to my web form.

This is what I wrote and it works.

Dim qrbarcode As BarcodeLib.Barcode.QRCode
qrbarcode = New BarcodeLib.Barcode.QRCode()

qrbarcode.Data = "111110000"

qrbarcode.ModuleSize = 3
qrbarcode.LeftMargin = 12
qrbarcode.RightMargin = 12
qrbarcode.TopMargin = 12
qrbarcode.BottomMargin = 12
qrbarcode.ImageFormat = System.Drawing.Imaging.ImageFormat.Png

' save barcode image into your system
qrbarcode.drawBarcode("c:/vbnet-qrcode.png")
If you still can not produce a barcode image, maybe you can see the FAQs page here.

This is good. The vb code I have used is this:
Imports OnBarcode.Barcode


Dim barcode As QRCode = New QRCode

'QRCode Barcode Basic Settings

'QRCode Valid data char set:
'numeric data (digits 0 - 9);
'alphanumeric data (digits 0 - 9; upper case letters A -Z;
'nine other characters: space, $ % * + - . / : );
'byte data (default: ISO/IEC 8859-1);
'Kanji(characters)
barcode.Data = "112233445566"

barcode.DataMode = QRCodeDataMode.Auto
barcode.Version = QRCodeVersion.V1
barcode.ECL = QRCodeECL.L

'Set the ProcessTilde property to true,if you want use the tilde character "~"
'to specify special characters in the input data. Default is false.

'1) 1-byte character: ~0dd/~1dd/~2dd (character value from 000 ~ 255);
' ASCII character '~' is presented by ~126;
' Strings from "~256" to "~299" are unused
' modified to FS, GS, RS and US respectively.
'2) 2-byte character (Unicode): ~6ddddd (character value from 00000 ~ 65535)
' Strings from "~665536" to "~699999" are unused
'3) for GS1 AI Code:
' ~ai2: AI with 2 digits
' ~ai3: AI with 3 digits
' ~ai4: AI with 4 digits
' ~ai5: AI with 5 digits
' ~ai6: AI with 6 digits
' ~ai7: AI with 7 digits
'4) ECI: ~7dddddd (valid value of dddddd from 000000 to 999999)
'5) SJIS: from ~9ddddd (Shift JIS 0x8140 ~ 0x9FFC and 0xE040 ~ 0xEBBF)
barcode.ProcessTilde = True

' Barcode Size Related Settings
barcode.UOM = UnitOfMeasure.PIXEL
barcode.X = 3
barcode.LeftMargin = 0
barcode.RightMargin = 0
barcode.TopMargin = 0
barcode.BottomMargin = 0
barcode.Resolution = 96
barcode.Rotate = Rotate.Rotate0

' Image format setting
barcode.ImageFormat = System.Drawing.Imaging.ImageFormat.Gif()
barcode.drawBarcode("c://qr-code.gif")
If you want to change the parameters of the barcode, you can read this barcode image settings in VB.NET.

erh...here is the sample code of qr code in vb.net i know
'QR Code Version options, V1-V40 supported.
qrcode.QRCodeVersion = KeepAutomation.Barcode.QRCodeVersion.V10
'QR Code Version Error Correction Level, 4 modes (H, L, M, Q) supported.
qrcode.QRCodeECL = KeepAutomation.Barcode.QRCodeECL.H
'QR Code data mode, supporting AlphaNumeric, Auto, Byte, Customer, Kanji, Numeric
qrcode.QRCodeDataMode = KeepAutomation.Barcode.QRCodeDataMode.Auto
'Set QR Code valid input: All ASCII characters, including 0-9, A-Z, a-z, special characters. Length: variable.
qrcode.CodeToEncode = "vbQRCode"

'QR Code unit of measure: pixel, cm and inch
qrcode.BarcodeUnit = KeepAutomation.Barcode.BarcodeUnit.Pixel
'QR Code image resolution in dpi
qrcode.DPI = 72

'QR Code Size-related Settings
'QR Code bar module width (X dimention)
qrcode.X = 2
'QR Code bar module height (Y dimention), Y=X
qrcode.Y = 2
'Image margin size, minimum value is 4X on all four sides according to specification.
qrcode.LeftMargin = 8
qrcode.RightMargin = 8
qrcode.TopMargin = 8
qrcode.BottomMargin = 8
'Generate Data Matrix in Png, Jpeg, Gif, Bmp, Tiff image formats.
qrcode.ImageFormat = Drawing.Imaging.ImageFormat.Png
qrcode.generateBarcodeToImageFile("C://qrcode_4_vb.png")

have you ever seen this article how to use barcode in asp.net

I use ASP.NET QR Code Generator:
Add ASP.NET Barcode Generator Control to your Visual Studio ToolBox.
Copy "qrcode.aspx" and "qrcode.aspx.cs" to the folder where your aspx pages are generating barcodes.
Drag and drop "QRCodeWebForm" to your ASPX web forms.
Run the website to view the barcodes generated. To customize QR Code settings, view QR Code barcode settings.

error when i use your code, please fix this