VB.NET DataTable SqlDataReader Example – SqlDataReader DataTable Example VB.NET

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VB.NET DataTable SqlDataReader Example – SqlDataReader DataTable Example VB.NET

Purpose: – Illustrates using DataTable loaded from SqlDataReader.
Prerequistes:

1. Install Visual Basic (Express or Standard Edition)
2. Install SQL Server Express
3. Download Northwind and pubs Database
4. Attach Northwind Database to Databases in Sql Express
5. Attach pubs Database to Databases in Sql Express

Notes:

• Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
• You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb

Instructions:

1. Use Visual Basic 2008 Express or Standard Edition
2. Create new project;
   • Click File/New Project
   • Select Console Application Template
   • Select Visual Basic for Language
   • name of project could be VBNET_Syntax.
3. Add New folder named "ADONET"
   • Right-click project name in solution explorer;
   • add new folder;
   • name of folder could be: ADONET
4. Add Class Named clsDataTableSqlDataReader to ADONET folder
   • Right-click ADONET folder;
   • add new item;
   • Select class
   • Class name could be clsDataTableSqlDataReader
5. Click on copy code in code below to copy code into clsDataTableSqlDataReader.vb
6. Click on copy code in second set of code below to copy code into Module1.vb
7. Click green arrow or press F5 to run program

Step 1: Use Copy Code to Cut-n-paste code into clsDataTableSqlDataReader.vb

 Visual Basic | 
 copy code |
?
 
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Imports System
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Imports System.Data
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Imports System.Data.SqlClient
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Public Class clsDataTableSqlDataReader
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    Shared WithEvents con As SqlConnection
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    Public Sub Main()
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        con = New SqlConnection("Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI")
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        Dim cmd As New SqlCommand()
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        cmd.CommandText = "SELECT EmployeeID, FirstName + ' ' + LastName as FullName FROM Employees"
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        cmd.Connection = con
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        Dim Table1 As DataTable
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        Table1 = New DataTable("Employees")
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        'creating a table named Employees
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        Dim Row1 As DataRow
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        'declaring row for the table
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        Dim EmployeeID As DataColumn = New DataColumn("EmployeeID")
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        'declaring a column named EmployeeID
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        EmployeeID.DataType = System.Type.GetType("System.Int32")
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        'setting the datatype for the column
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        Table1.Columns.Add(EmployeeID)
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        'adding the column to table
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        Dim FullName As DataColumn = New DataColumn("FullName")
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        FullName.DataType = System.Type.GetType("System.String")
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        Table1.Columns.Add(FullName)
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        Try
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            con.Open()
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            Dim reader As SqlDataReader = cmd.ExecuteReader '(CommandBehavior.SingleRow)
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            While reader.Read()
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                Row1 = Table1.NewRow()
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                'declaring a new row
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                Row1.Item("EmployeeID") = reader.GetInt32(0)
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                'filling the row with values. Item property is used to set the field value.
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                Row1.Item("FullName") = reader.GetString(1)
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                'filling the row with values. adding FullName
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                Table1.Rows.Add(Row1)
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            End While
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            reader.Close()
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        Finally
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            con.Close()
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        End Try
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        For Each row In Table1.Rows
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            Console.WriteLine(row.Item("EmployeeID").ToString().PadRight(10) + row.Item("FullName").ToString())
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        Next
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        Console.ReadLine()
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    End Sub
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End Class
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 Visual Basic | 
 copy code |
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01
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Module Module1
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    Sub Main()
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        '***** ADONET *************
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        Dim myDataTableSqlDataReader As New clsDataTableSqlDataReader
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        myDataTableSqlDataReader.Main()
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    End Sub
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End Module
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