XML is a general purpose tag based language and very easy to transfer and store data across applications. The .Net technology is widely supported XML file format. The .Net Framework provides the Classes for read, write, and other operations in XML formatted files . Moreover the Dataset in ADO.NET uses XML format as its internal storage format.
There are several ways to create an XML file . In the previous sections we already saw how to create an XML file using XmlTextWriter and also created an XML file using manually created Dataset. Here we are going to create an XML file from Database. Make an SQL connection to the Database and execute the sql and store the data in a Datset. Call Dataset's WriteXml() method and pass the file name as argument.
Imports System.Xml Imports System.Data.SqlClient Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim connetionString As String Dim connection As SqlConnection Dim adapter As SqlDataAdapter Dim ds As New DataSet Dim sql As String connetionString = "Data Source=servername;Initial Catalog=databsename;User ID=username;Password=password" connection = New SqlConnection(connetionString) sql = "select * from Product" Try connection.Open() adapter = New SqlDataAdapter(sql, connection) adapter.Fill(ds) connection.Close() ds.WriteXml("Product.xml") MsgBox("Done") Catch ex As Exception MsgBox(ex.ToString) End Try End Sub End Class