VB.NET DataTable SqlDataReader Example – SqlDataReader DataTable Example VB.NET
VB.NET DataTable SqlDataReader Example – SqlDataReader DataTable Example VB.NET
Purpose: – Illustrates using DataTable loaded from SqlDataReader.
Prerequistes:
- Install Visual Basic (Express or Standard Edition)
- Install SQL Server Express
- Download Northwind and pubs Database
- Attach Northwind Database to Databases in Sql Express
- 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:
- Use Visual Basic 2008 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select Visual Basic for Language
- name of project could be VBNET_Syntax.
- Add New folder named “ADONET”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: ADONET
- Add Class Named clsDataTableSqlDataReader to ADONET folder
- Right-click ADONET folder;
- add new item;
- Select class
- Class name could be clsDataTableSqlDataReader
- Click on copy code in code below to copy code into clsDataTableSqlDataReader.vb
- Click on copy code in second set of code below to copy code into Module1.vb
- Click green arrow or press F5 to run program
Step 1: Use Copy Code to Cut-n-paste code into clsDataTableSqlDataReader.vb
Imports System Imports System.Data Imports System.Data.SqlClient Public Class clsDataTableSqlDataReader Shared WithEvents con As SqlConnection Public Sub Main() con = New SqlConnection("Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI") Dim cmd As New SqlCommand() cmd.CommandText = "SELECT EmployeeID, FirstName + ' ' + LastName as FullName FROM Employees" cmd.Connection = con Dim Table1 As DataTable Table1 = New DataTable("Employees") 'creating a table named Employees Dim Row1 As DataRow 'declaring row for the table Dim EmployeeID As DataColumn = New DataColumn("EmployeeID") 'declaring a column named EmployeeID EmployeeID.DataType = System.Type.GetType("System.Int32") 'setting the datatype for the column Table1.Columns.Add(EmployeeID) 'adding the column to table Dim FullName As DataColumn = New DataColumn("FullName") FullName.DataType = System.Type.GetType("System.String") Table1.Columns.Add(FullName) Try con.Open() Dim reader As SqlDataReader = cmd.ExecuteReader '(CommandBehavior.SingleRow) While reader.Read() Row1 = Table1.NewRow() 'declaring a new row Row1.Item("EmployeeID") = reader.GetInt32(0) 'filling the row with values. Item property is used to set the field value. Row1.Item("FullName") = reader.GetString(1) 'filling the row with values. adding FullName Table1.Rows.Add(Row1) End While reader.Close() Finally con.Close() End Try For Each row In Table1.Rows Console.WriteLine(row.Item("EmployeeID").ToString().PadRight(10) + row.Item("FullName").ToString()) Next Console.ReadLine() End Sub End Class |
Step 2: Use View Plain to Cut-n-paste code into Module1.vb
Module Module1 Sub Main() '***** ADONET ************* Dim myDataTableSqlDataReader As New clsDataTableSqlDataReader myDataTableSqlDataReader.Main() End Sub End Module |