4. WINDOWS COMMON CONTROLS DEFAULT EVENT HANDLERS

5. HOW TO ADD THE DATA’S TO CONTROL
SLNO
CONTROLS
HOW TO ADD THE DATA’S TO CONTROL
DEFAULT EVENT HANDLER 1.
Form
Form1.Text = “Chettinad”;
private void Form1_Load(object sender, EventArgs e){ } 2.
Button
Button1.Text=”Click Here”;
private void button1_Click(object sender, EventArgs e) { }
Label
Label.Text=”Enter the A Value”;
private void label1_Click(object sender, EventArgs e) { } 3.
Textbox
Textbox1.Text=”Insert the Text Here”;
private void textBox1_TextChanged(object sender, EventArgs e) { } 4.
Checkbox
Checkbox1.Text=”Addition”;
private void checkBox1_CheckedChanged(object sender, EventArgs e) { } 5.
Radiobutton
Radiobutton1.Text=”Addition”;
private void radioButton1_CheckedChanged(object sender, EventArgs e) { } 6.
CheckListBox
CheckListbox.Items.add(“Add”);
CheckLIstbox.Items.add(“Sub”);
private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e) { } 7.
ComboBox
Combobox.Items.add(“Add”);
Combobox.Items.add(“Sub”);
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { } 8.
ListBox
Listbox1.Items.add(“Add”);
Listbox1.Items.add(“Sub”);
private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { } 9.
Picturebox
Picturebox1.Load(“Picture File Path”)
private void pictureBox1_Click(object sender, EventArgs e) { }
10.
Progressbar
NIL
private void progressBar1_Click(object sender, EventArgs e) { }
11.
Treeview
Treeview1.Items.add(“Add”);
TreeView1.Items.add(“Sub”);
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { }
12.
Listview
Listview1.Items.add(“Add”);
Listview1.Items.add(“Sub”);
private void listView1_SelectedIndexChanged(object sender, EventArgs e) { }
13.
Groupbox
Groupbox1.Controls.add(button1);
private void groupBox1_Enter(object sender, EventArgs e) { }
14.
Timer
Nil
private void timer1_Tick(object sender, EventArgs e) { }

6. WINDOWS COMMON CONTROL PROPERTIES

7. SLNO
PROPERITE NAME
PROPERTY VALUE
DESCRIPTION 1.
Name
“Form1”
Indicates the name used in code to identify the object or control 2.
Autosize
True or False
Specifies whether a control will automatically size iteselft to fit its contents 3.
BackColor
Color Name
The background color of the component 4.
BackgroundImage
Image File path
The background image used for the control 5.
Enabled
Indicates whether the control is enabled 6.
ForeColor
The foreground color of this component, which is used to display text. 7.
Font
Font Face, Font Style, Font size, Font Color
The font used to display text in the control. 8.
Location
X, Y axis
The coordinates of the upper – left corner of the control relative to the upper – left corner of its container 9.
Locked
The Locked property determines if we can move or resize the control
10.
Size
Width and Height
The size of the control in pixels
11.
Text
“Text of the Particular Control”
The text associated with the control
12.
Visible
Determines whether the control is visible or hidden
13.
TabIndex
Index value to the control
Determines the index in the TAB order that this control will occupy.
14.
TabStop
Indicates whether the user can use the TAB key to give focus to the control.
15.
TextAlign
Left, Center, Rigth
The alignment of the text that will be displayed on the control.
16.
ToolTip Text
Tool Tip Text on the particular Control
Determines the tool tip shown when the mouse hovers over the control.
17.
UseMnemonic
If true, the first character proceeded by an ampersand (&) will be used as the button’s mnemonic key.

8. EXTRA PROPERTIES FOR THE WINDOWS CONTROLS

9. SLNO
CONTROL
NAME
PROPERITE NAME
PROPERTY VALUE
DESCRIPTION 1.
PictureBox
Image
.jpg or .bmp or .gif
The image display in the PictureBox.
WaitOnLoad
True or False
Controls whether processing will stop until the image is loaded. 2.
RadioButton
Checked
Indicates whether the component is in the checked state. 3.
Checkbox
CheckState
Unchecked or Checked
or Intermediate
Indicates the state of the component.
ThreeState
Indicates whether the CheckBox will allow three check states rather than two. 4.
TextBox
HideSelection
Indicates that the selection should be hidden when the edit control loses focus.
MaxLength
32767
Specifies the maximum number of character that can be entered into the edit control.
Multiline
Controls whether the text of the edit control can span more than one line.
PasswordChar
***** or &&&&&
Indicates the character to display for password input for single – line edit controls.
ScrollBars
None, Horizontal, Vertical
Indicates, for multiline edit contrls, which scroll bars, will be shown for this control.
WordWrap
Indicates if lines are automatically word – wrapped for multiline edit controls.
ShortcutsEnabled
Indicates whether shortcuts defined for the control are enabled. 5.
Form
ControlBox
Determines whether a form has a Control / System menu box.
Cursor
Different Cursor Control
The Cursor that appear when the pointer moves over the control.
MaximizeBox
Determines whether a form has a maximize box in the upper – right corner of its caption bar.
MinimizeBox
Determines whether a form has a minimize box in the upper – right corner of its caption bar.
StartPosition
Windows appears for the
different location
Determines the position of a form when it first appears.
WindowState
Normal, Maximize, Minimize 6.
Timer
Enabled
Enables generation of Elapsed events
Interval
1000 (milliseconds)
The frequency of Elapsed events in milliseconds 7.
ProgressBar
Minimum
The lower bound of the range this ProgressBar is working with.
Maximum
1000
The upper bound of the range this ProgressBar is working with.

18. MessageBox Program
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Form1 : Form
public Form1()
InitializeComponent(); }

19. private void button1_Click(object sender, EventArgs e){
MessageBox.Show("Welcome to Chettinad College of Engineering and Technology"); }
private void button2_Click(object sender, EventArgs e)
MessageBox.Show("Welcome", "Chettinad", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Stop);
private void button3_Click(object sender, EventArgs e)
DialogResult ans = MessageBox.Show("Arithmetic Operation", "Welcome", MessageBoxButtons.OKCancel);
if (ans == DialogResult.OK )
MessageBox.Show("Click OK Button");
else if(ans == DialogResult.Cancel)
MessageBox.Show("Click Cancel Button");
private void button4_Click(object sender, EventArgs e)
Button_Control f2 = new Button_Control();
f2.Show();

20. Addition of Two Numbers using Button, Label and Textbox
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Button_Control : Form
public Button_Control()
InitializeComponent(); }
private void button1_Click(object sender, EventArgs e)
int a, b, c;
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
c = a + b;
textBox3.Text = c.ToString();

21. Arithmetic Operation using Checkboxes
private void checkBox1_CheckedChanged(object sender, EventArgs e) {
if (checkBox1.Checked == true)
checkBox2.Checked = false;
checkBox3.Checked = false;
checkBox4.Checked = false;
checkBox5.Checked = false;
x = textBox1.Text;
y = textBox2.Text;
a = int.Parse(x);
b = int.Parse(y);
c = a + b;
textBox3.Text = c.ToString();
} }
namespace WindowsApplication1 {
public partial class CheckBox_Control : Form
public CheckBox_Control()
InitializeComponent(); }
int a, b, c;
string x, y;

22. private void checkBox3_CheckedChanged(object sender, EventArgs e){
if (checkBox3.Checked == true)
checkBox1.Checked = false;
checkBox2.Checked = false;
checkBox4.Checked = false;
checkBox5.Checked = false;
x = textBox1.Text;
y = textBox2.Text;
a = int.Parse(x);
b = int.Parse(y);
c = a * b;
textBox3.Text = c.ToString(); }
private void checkBox2_CheckedChanged(object sender, EventArgs e) {
if (checkBox2.Checked == true)
checkBox1.Checked = false;
checkBox3.Checked = false;
checkBox4.Checked = false;
checkBox5.Checked = false;
x = textBox1.Text;
y = textBox2.Text;
a = int.Parse(x);
b = int.Parse(y);
c = a - b;
textBox3.Text = c.ToString(); }

23. private void checkBox4_CheckedChanged(object sender, EventArgs e){
if (checkBox4.Checked == true)
checkBox1.Checked = false;
checkBox2.Checked = false;
checkBox3.Checked = false;
checkBox5.Checked = false;
x = textBox1.Text;
y = textBox2.Text;
a = int.Parse(x);
b = int.Parse(y);
c = a / b;
textBox3.Text = c.ToString(); }
private void checkBox5_CheckedChanged(object sender, EventArgs e) {
if (checkBox5.Checked == true)
checkBox1.Checked = false;
checkBox2.Checked = false;
checkBox3.Checked = false;
checkBox4.Checked = false;
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = ""; }

24. Arithmetic Operation using Radio Buttons
private void radioButton1_CheckedChanged(object sender, EventArgs e) {
if (radioButton1.Checked == true)
radioButton2.Checked = false;
radioButton3.Checked = false;
radioButton4.Checked = false;
radioButton5.Checked = false;
try
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text); }
catch
c = a + b;
textBox3.Text = c.ToString();
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Radio_Control : Form
int a, b, c;
public Radio_Control()
InitializeComponent(); }

25. private void radioButton2_CheckedChanged(object sender, EventArgs e){
if (radioButton2.Checked == true)
radioButton1.Checked = false;
radioButton3.Checked = false;
radioButton4.Checked = false;
radioButton5.Checked = false;
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
c = a - b;
textBox3.Text = c.ToString(); }
private void radioButton3_CheckedChanged(object sender, EventArgs e) {
if (radioButton3.Checked == true)
radioButton1.Checked = false;
radioButton2.Checked = false;
radioButton4.Checked = false;
radioButton5.Checked = false;
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
c = a * b;
textBox3.Text = c.ToString(); }

26. private void radioButton4_CheckedChanged(object sender, EventArgs e){
if (radioButton4.Checked == true)
radioButton1.Checked = false;
radioButton2.Checked = false;
radioButton3.Checked = false;
radioButton5.Checked = false;
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
c = a / b;
textBox3.Text = c.ToString(); }
private void radioButton5_CheckedChanged(object sender, EventArgs e) {
if (radioButton5.Checked == true)
radioButton1.Checked = false;
radioButton2.Checked = false;
radioButton3.Checked = false;
radioButton4.Checked = false;
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = ""; }
private void Form6_Load(object sender, EventArgs e)
radioButton5.Checked = false;

27. Arithmetic Operation using ComboBox and ListBox
private void Form5_Load(object sender, EventArgs e) {
comboBox1.Items.Add("Addition");
comboBox1.Items.Add("Subtraction");
comboBox1.Items.Add("Multiplication");
comboBox1.Items.Add("Division");
comboBox1.Items.Add("Clear");
listBox1.Items.Add("Addition");
listBox1.Items.Add("Subtraction");
listBox1.Items.Add("Multiplication");
listBox1.Items.Add("Division");
listBox1.Items.Add("Clear"); }
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Form5 : Form
int a, b, c;
public Form5()
InitializeComponent(); }

28. private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) {
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
if (comboBox1.SelectedIndex == 0)
c = a + b;
textBox3.Text = c.ToString(); }
if (comboBox1.SelectedIndex == 1)
c = a - b;
if (comboBox1.SelectedIndex == 2)
c = a * b;
if (comboBox1.SelectedIndex == 3)
c = a / b;
if (comboBox1.SelectedIndex == 4)
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
private void listBox1_SelectedIndexChanged(object sender, EventArgs e) {
a = int.Parse(textBox1.Text);
b = int.Parse(textBox2.Text);
if (listBox1.SelectedIndex == 0)
c = a + b;
textBox3.Text = c.ToString(); }
if (listBox1.SelectedIndex == 1)
c = a - b;
if (listBox1.SelectedIndex == 2)
c = a * b;
if (listBox1.SelectedIndex == 3)
c = a / b;
if (listBox1.SelectedIndex == 4)
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
} }

29. Arithmetic Operation using CheckListBox
private void Checkboxlist_Control_Load(object sender, EventArgs e) {
checkedListBox1.Items.Add("Addition");
checkedListBox1.Items.Add("Subtraction");
checkedListBox1.Items.Add("Multiplication");
checkedListBox1.Items.Add("Division");
checkedListBox1.Items.Add("Clear"); }
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Checkboxlist_Control : Form
public Checkboxlist_Control()
InitializeComponent(); }
int a, b, c;

30. private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e){
a = int.Parse (textBox1 .Text );
b = int.Parse (textBox2 .Text );
if (checkedListBox1.SelectedIndex == 0)
c = a + b;
textBox3.Text = c.ToString(); }
if (checkedListBox1.SelectedIndex == 1)
c = a - b;
if (checkedListBox1.SelectedIndex == 2)
c = a * b;
if (checkedListBox1.SelectedIndex == 3)
c = a / b;
if (checkedListBox1.SelectedIndex == 4)
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";

31. PROGRAM FOR THE PICTURE BOX
namespace WindowsApplication1 {
public partial class Picturebox_Control : Form
public Picturebox_Control()
InitializeComponent();
and Settings\All Users\Documents\My Pictures\Sample Pictures\sunset.jpg"); }
private void button1_Click(object sender, EventArgs e)
pictureBox1 .Image = Image .FromFile and Settings\All Users\Documents\My Pictures\Sample Pictures\sunset.jpg");
pictureBox1.ImageLocation = "
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

32. PROGRAM FOR THE PROGRESS BAR
private void Progress_Control_Load(object sender, EventArgs e) {
progressBar1.Minimum = 0;
progressBar1.Maximum = 1000; }
private void button1_Click(object sender, EventArgs e)
progressBar1.Increment(10);
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Progress_Control : Form
public Progress_Control()
InitializeComponent(); }

33. PROGRAM FOR THE PROGRESS BAR AND THE TIMER
private void Timer_Control_Load(object sender, EventArgs e) {
progressBar1.Minimum = 0;
progressBar1.Maximum = 1000; }
private void timer1_Tick(object sender, EventArgs e)
progressBar1.Increment(100);
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Timer_Control : Form
public Timer_Control()
InitializeComponent(); }
NOTE
In the Timer Control Properties change the Enabled properties is True and the set the Time Interval ( not Zero)

34. PROGRAM FOR THE LIST VIEW
private void button1_Click(object sender, EventArgs e) {
listView1.View = View.LargeIcon; }
private void button2_Click(object sender, EventArgs e)
listView1.View = View.SmallIcon;
private void button3_Click(object sender, EventArgs e)
listView1.View = View.List;
private void button4_Click(object sender, EventArgs e)
listView1.View = View.Details;
private void button5_Click(object sender, EventArgs e)
listView1.Clear();
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1 {
public partial class Listview_Control : Form
public Listview_Control()
InitializeComponent(); }

35. Creating Calculator Program using the Code File
(Design view and Code view Creating to the User)
//1. Include the Namespaces//
using System;
using System.Drawing;
using System.Windows.Forms;
//2. Create a class that inherit from Form class of Windows//
public class ButtonDemo: Form {
//3.Create the Controls //
Button b0; Button b1; Button b2; Button b3; Button b4; Button b5; Button b6; Button b7;
String s1=""; String s2=""; String op="";
TextBox t1;
//4.Create the class Constructor methosd to invoke the components to be initialized//
public ButtonDemo()
//5. Invoke the method to initialize the components//
InitializeComponent(); }

36. private void InitializeComponent(){
// Initilaize the components properties and Events//
t1=new TextBox();
t1.Name="textbox1";
t1.Location=new Point(50,80);
t1.Size=new System.Drawing.Size(80,50);
this.Controls.Add(t1);
b0=new Button();
b0.Location=new Point(50,120);
b0.Size=new System.Drawing.Size(25,25);
b0.Text="0";
b0.Click+=new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b0);
b1=new Button();
b1.Location=new Point(75,120);
b1.Size=new System.Drawing.Size(25,25);
b1.Text="1";
b1.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b1);
b2 = new Button();
b2.Location = new Point(100, 120);
b2.Size = new System.Drawing.Size(25, 25);
b2.Text = "2";
b2.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b2);

37. b6.Location = new Point(100, 145);
b3 = new Button();
b3.Location = new Point(125, 120);
b3.Size = new System.Drawing.Size(25, 25);
b3.Text = "3";
b3.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b3);
b4 = new Button();
b4.Location = new Point(50, 145);
b4.Size = new System.Drawing.Size(25, 25);
b4.Text = "4";
b4.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b4);
b5 = new Button();
b5.Location = new Point(75, 145);
b5.Size = new System.Drawing.Size(25, 25);
b5.Text = "+";
b5.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b5);
b6 = new Button();
b6.Location = new Point(100, 145);
b6.Size = new System.Drawing.Size(25, 25);
b6.Text = "-";
b6.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b6);
b7 = new Button();
b7.Location = new Point(125, 145);
b7.Size = new System.Drawing.Size(25, 25);
b7.Text = "=";
b7.Click += new System.EventHandler(this.btnsubmit_Click);
this.Controls.Add(b7);
this.Name="Button Demo";
this.Text="Button Demo"; }

38. else if(sender.Equals(b7)) { if(op.Equals("+"))
//Events handling Procedures//
private void btnsubmit_Click(Object sender, EventArgs e) {
if(sender.Equals(b0))
t1.Text += "0"; }
else if (sender.Equals(b1))
t1.Text += "1";
else if (sender.Equals(b2))
t1.Text+="2";
else if (sender.Equals(b3))
t1.Text += "3";
else if (sender.Equals(b4))
t1.Text += "4";
else if (sender.Equals(b5))
s1=t1.Text;
t1.Text="";
op=b5.Text; }
else if(sender.Equals(b7)) {
if(op.Equals("+"))
MessageBox.Show((Int32.Parse(t1.Text)+Int32.Parse(s1)).ToString());
public class Demo
static void Main()
System.Windows.Forms.Application.Run(new ButtonDemo());

39. Output of the Above program is

40. Data Access with ADO.NET

41. ADO.NET relational data bases XML data other data sources
Is the .NET technology for accessing structured data
Uniform object oriented interface for different data sources
relational data bases
XML data
other data sources
Designed for distributed and Web applications
Provides 2 models for data access
connection-oriented
connectionless

42. Idea of Universal Data Access
Connection of (object-oriented) programming languages and relational data bases
Uniform programming model and API
Special implementations for data sources (providers)

43. Data Providers
Microsoft’s layered architecture for data access

44. History of Universal Data Access (Microsoft)
ODBC
OLE DB
ADO (ActiveX Data Objects)
ADO.NET
ADO
ADO.NET
connection-oriented
connection-oriented + connectionless
sequential access
sequential access + main-memory representation with direct access
only one table supported
more than one table supported
COM-marshalling
XML-marshalling

45. DIFFERENCES BETWEEN ADO AND ADO .NET
ADO has one main object that is used to reference data, called the Record set object. This object basically gives you a single table view of your data, although you can join tables to create a new set of records.  
With ADO.NET, you have various objects that allow you to access data in various ways. The Dataset object will actually allow you to store the relational model of your database. This allows you to pull up customers and their orders, accessing/updating the data in each related table individually.
ADO works with connected data. This means that when you access data, such as viewing and updating data, it is real-time, with a connection being used all the time. This is barring, of course, you programming special routines to pull all your data into temporary tables.  
ADO.NET uses data in a disconnected fashion. When you access data, ADO.NET makes a copy of the data using XML. ADO.NET only holds the connection open long enough to either pull down the data or to make any requested updates. This makes ADO.NET efficient to use for Web applications. It's also decent for desktop applications.
In ado user can move sequentially to database
In ado.net user can move one data from one table to another table.
ADO allows you to create client-side cursors only
ADO.NET we don't have any cursor support in ADO.NET.
ADO allows you to persist records in XML format
ADO.NET allows you to manipulate your data using XML as the primary means. This is nice when you are working with other business applications and also helps when you are working with firewalls because data is passed as HTML and XML.  
COM – marshalling
XML – marshalling

46. Architecture of ADO.NET

47. Architecture represents connection to data source
DbConnection
represents connection to data source
DbCommand
represents a SQL command
DbTransaction
represents a transaction
commands can be executed within a transaction
DataReader
result of a data base query
allows sequential reading of rows

48. DataTables and DataColumns
DataAdapter
DataAdapter as a bridge between the DataSet and the data source, which is underlying database DataAdapter provides the Fill() method to retrieve data from the database and populate the dataset
DataSet
A DataSet represents a complete set of data including the tables that contain, order, and constrain the data, as well as the relationships between the tables.
DataTables and DataColumns
The DataTable has a number of public properties, including the columns collection, which returns the DataColumnCollection object ,which in trun consists of DataColumn objects. Each DataColumn object represents a column in a table
DataRelations
DataRelation represents a relationship between two tables through DataColumn objects. For example, in the Northwind database the Customers table is in a relationship with the Orders table through the CustomerID column
DataRows
- DataTable’s Rows collection returns a set of rows for that table. Use this collection to examine the results of queries against the database, iterating throught the rows to examine each record in trun.

49. Connection-oriented versus Connectionless
Keeps the connection to the data base alive
Always up-to-date data
Intended for applications with:
short running transactions
only a few parallel access operations
Connectionless
No permanent connection to the data source
Data cached in main memory
Changes in main memory may be in conflict with changes in data source
many parallel and long lasting access operations (e.g.: Web applications)

50. IDbConnection: Property ConnectionString

51. ExecuteNonQuery Method

52. ExecuteScalar Method

53. ADO.NET and Transactions
2 transaction models
local transactions:
transactions for one connection
provided by ADO.NET
distributed transactions:
transactions for several connections
usage of Microsoft Distributed Transaction Component (MSDTC)
namespace System.Transaction