good article for XSL: The Complete Guide

http://www.sagehill.net/docbookxsl/

Build custon XML from database using XmlTextWriter

Simple way to out put as xml is using
dim ds as dataset
ds.WriteXml("C:\test\HCSReports\createdXML\employee.xml")

if you need custom xml output then use the below function

Imports System.Xml
Imports System.Xml.XPath
Imports System.Xml.Xsl

  Public Function CreateCustomXML(ByVal objDataSet As DataSet) As String

        Dim intI As Integer
        Dim strPath As String

        'create an instance of the XmlTextWriter object
        Dim objWriter As XmlTextWriter = Nothing

        Try

            ' location to the XML file to write
            strPath = strFilepath & Now.Second & ".xml"

            objWriter = New XmlTextWriter(strPath, System.Text.Encoding.Default)

            ' start writing the XML document
            objWriter.WriteStartDocument()

            ' write a comment in our XML file
            objWriter.WriteComment("PanelManagerMonthlyReport")

            ' starting with the root element i.e. "movies"
            objWriter.WriteStartElement("PMMonthlyReport")

            'Set data to XML tags
            If objDataSet.Tables(0).Rows.Count > 0 Then
                For intI = 0 To objDataSet.Tables(0).Rows.Count - 1
                    objWriter.WriteStartElement("Period")    ' output the "Employee" element
                    objWriter.WriteElementString("Name", objDataSet.Tables(0).Rows(intI).Item("Name").ToString)
                    objWriter.WriteElementString("Prospects", objDataSet.Tables(0).Rows(intI).Item("Prospects").ToString)
                    objWriter.WriteElementString("Instructions", objDataSet.Tables(0).Rows(intI).Item("Instructions"))
                    objWriter.WriteElementString("Cancellations", objDataSet.Tables(0).Rows(intI).Item("Cancellations"))
                    objWriter.WriteElementString("Completions", objDataSet.Tables(0).Rows(intI).Item("Completions"))
                    objWriter.WriteElementString("Quotes", objDataSet.Tables(0).Rows(intI).Item("Quotes"))
                    objWriter.WriteElementString("IntroducerUserRegistrations", objDataSet.Tables(0).Rows(intI).Item("IntroducerUserRegistrations"))
                    objWriter.WriteElementString("IntroducerUserTrained", objDataSet.Tables(0).Rows(intI).Item("IntroducerUserTrained"))
                    objWriter.WriteElementString("SolicitorAppsIssued", objDataSet.Tables(0).Rows(intI).Item("SolicitorAppsIssued"))
                    objWriter.WriteElementString("SolicitorContractsReturned", objDataSet.Tables(0).Rows(intI).Item("SolicitorContractsReturned"))
                    objWriter.WriteElementString("Index", objDataSet.Tables(0).Rows(intI).Item("Index"))
                    objWriter.WriteEndElement()                 ' close "Employee" element
                Next
            End If

            ' end the "Menu" element
            objWriter.WriteEndElement()

            ' flush and write XML data to the file
            objWriter.Flush()

            Return strPath
        Catch ex As Exception
            Return False
        Finally
            ' clear up memory
            objWriter.Close()
            objWriter = Nothing
            objDataSet = Nothing
        End Try
    End Function

Design Patterns

http://www.dofactory.com/Patterns/Patterns.aspx#list
scroll down...

Creational Patterns
Abstract Factory	Creates an instance of several families of classes
Builder	Separates object construction from its representation
Factory Method	Creates an instance of several derived classes
Prototype	A fully initialized instance to be copied or cloned
Singleton	A class of which only a single instance can exist
Structural Patterns
Adapter	Match interfaces of different classes
Bridge	Separates an object’s interface from its implementation
Composite	A tree structure of simple and composite objects
Decorator	Add responsibilities to objects dynamically
Facade	A single class that represents an entire subsystem
Flyweight	A fine-grained instance used for efficient sharing
Proxy	An object representing another object
Behavioral Patterns
Chain of Resp.	A way of passing a request between a chain of objects
Command	Encapsulate a command request as an object
Interpreter	A way to include language elements in a program
Iterator	Sequentially access the elements of a collection
Mediator	Defines simplified communication between classes
Memento	Capture and restore an object's internal state
Observer	A way of notifying change to a number of classes
State	Alter an object's behavior when its state changes
Strategy	Encapsulates an algorithm inside a class
Template Method	Defer the exact steps of an algorithm to a subclass
Visitor	Defines a new operation to a class without change

'if the enum is :
Public Enum aslamEnum
Created = 0
AwaitingPayment
Active
InProduction
Complete
Cancelled
End Enum


'The function will return description if exist else the name:

Private Function GetEnumDescription(ByVal Value As aslamEnum) As String
Dim objFieldInfo As FieldInfo
Dim sRetVal As String
Dim objDescriptionAttributes() As DescriptionAttribute
Dim tEnum As Type = GetType(aslamEnum)

objFieldInfo = tEnum.GetField([Enum].GetName(tEnum, Value))
objDescriptionAttributes = objFieldInfo.GetCustomAttributes(GetType(DescriptionAttribute), False)
With objDescriptionAttributes
If .Length > 0 Then
sRetVal = objDescriptionAttributes(0).Description
Else
sRetVal = [Enum].GetName(tEnum, Value)
End If
End With

Return Trim(sRetVal)
End Function


'To get the value back either in Name or Description use
value=GetEnumDescription(varmyEnum)

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Forum

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asp.net vb.net shopping cart and c#

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c# http://www.codeproject.com/aspnet/ShoppingCartCSharp.asp

Payment Gateway:
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Drag and Drop Products to the Shopping Basket Using JavaScript
http://www.codeproject.com/aspnet/DragAndDropShopping.asp