.NET Technology

ByAkber Ahmed Khowaja

Today’s Discussion

What We Expect From Language? What is new in .NET? Comparisons with Previous Technologies /

JAVA / VB-6 etc. First Look of VB .NET

What is in Language?

Interaction With Other Language Platform Support Programming Technique (structured ? Procedural? OOP?)

Databases Support Database Handling Technique Thread Model Component Designing?

Network Support Programming? (Socket Programming)

Internet Programming ? Future / Reliability?

What is new in .NET Technology

.NET Framework covers all the layers of software development from the operating system up

.NET Framework

ASP.NET

Web Services Web FormsASP.NET Application Service

Windows Forms

Controls DrawingWindows Application Service

.NET Framework Base Classes

ADO.NET XML Threading IONet Security Diagnoses Etc.

Common Language Runtime

Memory Management

Common Type SystemLifecycle Monitoring

Windows Forms (Winforms)

Windows Form are a new way to create Standard WIN32 Desktop Application based on the Windows Foundation Classes(WFC)

Web Forms

Web Forms provide a powerful, form based user interface for web, it also contains additional .net ASP controls which was not present in previous versions, These controls provide Sever based events facility so that our application can be develop more easily and attractive.

Web Services

Provides a mechanism for programs to communicate over the Internet using SOAP (Simple Object Access Protocol).

Web Services provide an analog of Com and DCOM for object brokering and interfacing, but based on internet technologies so that allowance is made for integration, even with non Microsoft plateforms

CLR (Common Language Runtime)

Common Type SystemData Types / etc

Intermediate Language to Native Code Compiler

Execution Support Security

Garbage Collection

Memory Management(Previous version it was done by OS)

Multiple Language Support

.Net Environment Provides Multiple language Integration Support, se that we can use multiple Languages in single program.

For Example we can C# function in ASP.NET as well as in VB.NET

Cross language Inheritance is also Possible

So Mix Language development team can also participate to develop program.

How IT is Possible ? Answer CLR

Common Type System

All Languages use same Data types, their Length, Size, Type and specificaton will be same.

For example in Previous VB-6 use 16 bit Integer (2 bytes)

In Visual C integer was 4 Bytes.

Now For all .NET Support languages use int32 Integer for 4 Bytes.

Common Types

Boolean Sbyte (Signed Byte)Byte SingleCharDate/TimeDecimalDoubleInt16Int32Int46

Execution Support

JIT (Just in Time Compilation and Execution)

JIT Compiles with three methods:

1) Standard JIT: it Convert to exe code at the time of execution

2) Pre JIT: it it convert to exe code at the time of installation.

3) Econo JIT: it create low Optimization code, for low memory resources

Programming Technique

OOP (Object Oriented Programming)

a) Encapsulation

b) Inheritance

c) Polymorphism

Form Level Inheritance

1 2

1 2

3 4

Form 1 Form2 inherited from Form1

Database Handling

It use ADO+ or ADO.NET To handle different Databases

Disconnected Databases

SQL

OLEDB Drivers

(Will be discuss in Detail)

XML Support

It Gives XML support to represent Fast Data

VB.NET Programming

By:Akber Ahmed Khowaja

Today’s Discussion

VS.NET (Visual Studio.net Environment) Working With WinForms & important Properties Working With Events in .NET Data Base Creation with MS-SQL Server Database Handling with VS.NET

VS.NET Environment

Form Properties

Database Handling With ADO.NET

Import System.Data Import System.data.ADO

Create and set SQLConnection Create and set SQL DataAdapter Create and set Dataset

Steps to Create & Set SqlConnection

1. Place SqlConnection To Form (from Data toolBox)

2. Set its name property to con13. Set its Connection Property using connection

Wizard

Steps to Create & Set DataAdapter

1. Put DataAdapter Control to form2. Right click on That Control3. Select Configure4. Follow Steps to complete Process5. Right Click on DataAdapter Control, and

select Create DATASET

Put Following Code on Form’s Load Event

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

da1.Fill(ds1, "ghufi")

End Sub

Form Design Layout

Private Sub cmdLast_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdLast.Click

cnt = Me.ds1.Tables("ghufi").Rows.Count

Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Count - 1

MsgBox(cnt.ToString)

End Sub

Private Sub cmdNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNext.Click

Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Position + 1

End Sub

Private Sub cmdPrev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdPrev.Click

Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Position - 1

End Sub

Private Sub cmdFirst_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdFirst.Click

Me.BindingContext(ds1, "ghufi").Position = 0

End Sub

Todays Discussion

Few Language Tips How To search Working wit DataGrid Add Records Save Records

Few Language Changes

Data Types Declaration Methods Type Casting Option keyword Changes in Array

Data Types (Integers)

Byte 8 Bits 0 to 255 Short Integer Long

Floats

Single Double Decimal 128 bits

Others

Char String Varient Object

Declaration of Variables

Dim I , j , k as integer

Option

Option Explicit On/Off Option Compare Binary/Text Option Strict On/Off (Data type conversion)

Find Records

On Load

txtfind.Text = ds1.ghufi.Columns.Count() ComboBox1.Items.Add(ds1.ghufi.Columns(0).ColumnName) ComboBox1.Items.Add(ds1.ghufi.Columns(1).ColumnName) ComboBox1.Items.Add(ds1.ghufi.Columns(2).ColumnName) ComboBox1.Items.Add(ds1.ghufi.Columns(3).ColumnName)

Write Following Code under Find

Dim fldname As Stringfldname = ComboBox1.SelectedItem()ds1.Clear()da1.SelectCommand.CommandText =

"select * from ghufi where " & fldname & "='" & txtfind.Text & "'“da1.Fill(ds1, "ghufi")

If Me.BindingContext(ds1, "ghufi").Count <= 0 ThenMsgBox("Sorry No Record for your Search")

End If

Today’s Discussion (03/11/2002)

New Control “Notify Icon” How to Navigate B/W Forms Inheritance in Forms How User Master Details Add / Save

NotifyIcon Control

Notify Icon is a new control which put a link on System Tray, it automatically creates a new panel in system tray and shows Icon.

It’s Click Event Fires when we double click on that Icon.

We may use it for new form load, or terminate Application.

Steps to use NotifyTray

Drag and drop this control on Form Set it’s Icon Property with any suitable Icon Write “End” to its click event

Form Level Inheritance

Put Form1 as Following

Insert Another Form

Its coding is

Public Class Form4

Inherits System.Windows.Forms.FormPrivate Sub Form4_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

End Sub

End Class

Change this coding as

Public Class Form4

Inherits System.amin.form3Private Sub Form4_Load(ByVal sender As System.Object, ByVal e As

System.EventArgs) Handles MyBase.Load

End Sub

End Class

Set form4 as Default For and Run Program

Come back to Database

Master Details Forms

Database Structure

Put Sample Data

Form Structure

ListBox Properties, Datagrid Prop.

Code on ListIndexChanged

ds2.Clear()

da2.SelectCommand.CommandText = "select * from ghufi_details where id=" &

CInt(sender.Text)

da2.Fill(ds2, "ghufi_details")

output

VB.Net Programming

ByAkber Ahmed Khowaja

DialogBox

FileDialogBox SaveDialogBox FontDialogBox ColorDialogBox PrintDialogBox

Screen For Dialog Boxes

Open

Save

Font

Color

Print

Today’s Discussion (18/11/2002)

Add New Record with Programming Edit Record Delete Record

OpenFileDialogBox

Imports System.IO openDialog.Filter = "Text Files (*.txt)|*.txt|All Files|*.*“ openDialog.FilterIndex = 1 openDialog.InitialDirectory = "c:\“openDialog.Title = "Demo Open Dialog“openDialog.ShowDialog()strfilename = openDialog.FileNameDim objreader As StreamReader = New StreamReader(strfilename)

TextBox1.Text = objreader.ReadToEnd

objreader.Close() objreader = Nothing Do Until objreader.Read = -1 TextBox1.Text = TextBox1.Text &

objreader.ReadLine & vbCrLf

Loop

SaveDialog & FileStreamWriter

With saveDialog .DefaultExt = "txt“ .FileName = strfilename .Filter = "Text Files(*.txt)|*.txt|All Files|*.*“

.FilterIndex = 1 .InitialDirectory = "c:\“ .OverwritePrompt = True .Title = "File Save Demo“End WithsaveDialog.ShowDialog()strfilename = saveDialog.FileName

Dim objwriter As StreamWriter = New StreamWriter(strfilename, False)

objwriter.Write(TextBox1.Text)

objwriter.Close()

objwriter = Nothing

FontDialogBox

FontDialog.ShowColor = True

FontDialog.ShowDialog()

TextBox1.Font = FontDialog.Font

Color Dialog

colorDialog.ShowDialog()

TextBox1.ForeColor = FontDialog.Color

Print Dialog

PrintDialog.AllowPrintToFile = False

PrintDialog.AllowSelection = False

PrintDialog.AllowSomePages = False

PrintDialog.ShowDialog()

Menu Designing

Steps To Design Menu

There are two Types of Menues– Main Menu– Context Menu

Main Menu

This Menu Appear Normally on the Top of the form, this is very common menu for windows base applications.

ie. File, Edit, View etc

Context MenuThis menu is Small Menu Which appears when user right click on Any Form Item

Steps To Design Main Menu

Drag and drop main menu from Toolbox Write Menu Name Use & for Access Keys Set Properties of every menu

– Name– Shortcut

Steps Context Menu

Drag and drop Context menu from ToolBox Design some menu items

Every Control has Context menu property, we bind context menu property to context menu, so that menu will appear when user right click on that menu

Screen Layout

Import

Imports System.Data

Imports System.Data.OleDb

Imports System.DBNull

DeclarationsPublic Class Form2

Inherits System.Windows.Forms.Form

Public con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0; data source=d:\LibrarySystem\library.mdb")

Public da As OleDbDataAdapterPublic ds As DataSetPublic dw As DataViewPublic cm As CurrencyManager

Initializations (call two functions)

'Add any initialization after the InitializeComponent() call

 

FillData()

bindFields()

FillData Function Private Sub FillData() dw = Nothing ds = New DataSet() con.Open() da = New OleDbDataAdapter("select * from books", con) da.Fill(ds, "books") dw = New DataView(ds.Tables("books")) cm = CType(Me.BindingContext(dw), CurrencyManager) con.Close() End Sub

DataBinding Function

Private Sub bindFields()

TextBox1.DataBindings.Clear()

TextBox2.DataBindings.Clear() 

TextBox1.DataBindings.Add("text", dw, "code") TextBox2.DataBindings.Add("text", dw, "Name")

End Sub

Add Button Code

TextBox1.Text = ""

TextBox2.Text = ""

TextBox3.Text = ""

TextBox4.Text = ""

Save Button

Dim pos As Integer pos = cm.Position Dim cmd As New OleDbCommand()

cmd.Connection = con

cmd.CommandText = "Insert into books (code, name, author) values(?,?,?)“

cmd.CommandType = CommandType.Text

con.Open()

cmd.Parameters.Add(New OleDbParameter())cmd.Parameters.Item(0).Direction = ParameterDirection.Inputcmd.Parameters.Item(0).DbType = DbType.Stringcmd.Parameters.Item(0).Size = 10cmd.Parameters.Item(0).Value = TextBox1.Text

Try cmd.ExecuteNonQuery()Catch ex As Exception MsgBox("Error:=" & ex.Message)End Try con.Close() FillData() bindFields() MsgBox("Record Added") ds = Nothing da = Nothingcmd = NothingEnd sub

Edit

cmd.CommandText = "update books set name=?,author=? where code=?"

cmd.CommandType = CommandType.Text

 

Delete

cmd.CommandText = “delete from books where code=?"

cmd.CommandType = CommandType.Text

 

Pos=1

Me.BindingContext(ds1, "ghufi").AddNew()

da1.Update(ds1, "ghufi")

da1.Fill(ds1, "ghufi")

Handling ADO With Coding

By Akber Ahmed Khowaja

Code for Import Files

Imports System.Data

Imports System.Data.OleDb

Imports System.DBNull

 

Public Class Form2 . . . . .

. . . . .

Variable Declaration

• For Connection

• For Data Adapter

• For Dataset

Few Slides Are Remaining

Today’s Discussion (Dec 02, 2002)

Concept Of OOP What is Class Simple Class Methods Constructors Properties Data Base Handling With Class

What is OOP

OOP is Programming technique in which we make programs Flexible and Reusable.

Basic Concept of OOP is Designing Classes in Program.

What is Class

Class is Collection of Data / Properties and Methods/Functions which operate on that data.

Methods and Data are Encapsulated in Class, is called Encapsulation

We may Inherit functionality of one class to other class is

called Inheritance.With class one object may work with different ways is

called Polymorphism

A Simple Class

Write Click On Project add Class to your project

Public Class Person

Public FName As String

Public LName As String

Public Age As Integer

End Class

Form for Usage of “Person” class

Create Object for “Person” Class

Dim p1 As New Person()

Code for Insert Data / Show Data Buttons

p1.FName = TextBox1.Text

p1.LName = TextBox2.Text

p1.Age = CInt(TextBox3.Text)

TextBox1.Text = p1.FName

TextBox2.Text = p1.LName

TextBox3.Text = p1.Age

Encapsulation (Private Data and Access public Methods)

Public Class Person

Private FName As String Private LName As String Private Age As Integer 'setdata Method Public Sub setData(ByVal Fnm As String, ByVal LNm As String, ByVal ag As Integer)

FName = Fnm LName = LNm Age = ag End Sub

 

Public Function getFName() As String

Return (FName)

End Function

Public Function getLName() As String

Return (LName)

End Function

Public Function getAge() As Integer

Return (Age)

End Function

 End Class

Constructor

Constructor is Special Type of method which call automatically when object creates, we may use constructor for data initialization.

Public Sub New()

FName = "FName Not Set"

LName = "LName Not Set"

Age = 0

End Sub

Array Of Objects

Dim p(10) As Person Dim cntr As Integer

Screen For Use Array of Objects

Code for Set Data Button

p(cntr) = New Person()p(cntr).setData(TextBox1.Text, TextBox2.Text, CInt(TextBox3.Text))MsgBox("Data Stored as index number : " & CStr(cntr))cntr += 1 

Code for Show Data Button

Dim xx As Integer xx = txtIndex.text

TextBox1.Text = p(xx).getFName()

TextBox2.Text = p(xx).getLName()

TextBox3.Text = p(xx).getAge()

Properties For Class Property FName() As String

Get Return (XFName) End Get Set(ByVal Value As String) XFName = Value End Set

End Property

Use Properties

dim t1 as new Teacher() ‘ teacher is class

t1.FName = TextBox1.Text

t1.LName = TextBox2.Text

t1.Age = TextBox3.Text

Data base Handling with class

Public Class DataClass

Public con As OleDbConnection

Public da As OleDbDataAdapter

Public ds As DataSet

Public dw As DataView

Public cm As CurrencyManager

Method Open Connection

Public Sub openConnection(ByVal constr As String) con = New OleDbConnection(constr) con.Open()End Sub‘’’’’’’’’’’’’’’’’’’’’’’’’’’’ Private Sub setDa(ByVal sqlstr As String, ByVal cn As OleDbConnection)

da = New OleDbDataAdapter(sqlstr, cn)

End Sub

Public Sub FillData(ByVal sqlstr As String, ByVal dbnm As String, ByVal tblnm As String)

dw = Nothing ds = New DataSet() OpenConnection("Provider=Microsoft.jet.oledb.4.0; data source=f:\Inventory_VBNET\InventorySystem\" & dbnm) setDa(sqlstr, con)

da.Fill(ds, tblnm)dw = New DataView(ds.Tables(tblnm))

con.Close()

End Sub

Move Records

Public Sub MoveRecord(ByVal bc As BindingContext, ByVal tblnm As String, ByVal symbol As String)

If symbol = ">" Then bc(ds, tblnm).Position += 1 ElseIf symbol = "<" Then bc(ds, tblnm).Position -= 1 ElseIf symbol = "<<" Then bc(ds, tblnm).Position = 0 ElseIf symbol = ">>" Then bc(ds, tblnm).Position = bc(ds, tblnm).Count – 1

End If End Sub

Usage

‘Create Object Dim obj As New DataClass()

 'Add any initialization after the InitializeComponent() call

obj.FillData("select * from items", "Inventory.mdb", "Items")

showData()

Private Sub showData()

Dim pos As Integer pos = Me.BindingContext(obj.ds, "items").Position

TextBox1.Text = obj.ds.Tables("items").Rows(pos).Item("itemName")

End Sub

Show Data Method

Code For Next Button_Click

obj.MoveRecord(Me.BindingContext, "Items", ">")showData()