.NET basics

Question 1

Common Language Runtime (CLR)

Answer 1

The engine that executes all .NET programs

Question 2

Common Intermediate Language (CIL)

Answer 2

The language used by the CLR

Question 3

C# strings and escaped characters

Answer 3

• " (double quote)
• \n (new line)
• \t (horizontal tab)
• \ (backward slash)

Question 4

Arrays

Answer 4

• string []
• int []
• int [,] (two-dimensional int array)

Question 5

ArrayList

Answer 5

• Dynamic collection that supports any type of object and allows resizing
• Example:
  
  • ArrayList x = new ArrayList();

Question 6

Delegates

Answer 6

Can be used as variables to point at methods that accept the same parameters

Question 7

script runat = “server”

Answer 7

Sets the code to run on the web server, rather than in the user’s web browser

Question 8

Generics

Answer 8

A class that supports any type of variables or objects

Question 9

Try parse

Answer 9

• Returns a boolean representing the success or failure of the parse method
• Example:
  
  • bool success = Decimal.TryParse(X.Value, out XX)

Question 10

if (IsPostBack == false)

Answer 10

Postback verifies that the page is being loaded for the first time. It is used in order to initialize content only on the first load

Question 11

ListItem Class

Answer 11

• Attributes - Gets a collection of attribute name and value pairs for the ListItem that are not directly supported by the class
• Enabled - Gets or sets a value indicating whether the list item is enabled
• Selected - Gets or sets a value indicating whether the item is selected
• Text - Gets or sets the text displayed in a list control for the item represented by the ListItem
• Value - Gets or sets the value associated with the ListItem

Question 12

HtmlSelect Class

Answer 12

• Value - Gets the value of the selected item in the HtmlSelect control or sets the SelectedIndex property of the control to the index of the first item in the list with the specified value
• SelectedIndex - Gets or sets the ordinal index of the selected item in an HtmlSelect control
• InnerText - Gets or sets the content between the opening and closing tags of the control with automatic conversion of special characters to their equivalent HTML entities. This property is not supported for this control.(Overrides HtmlContainerControl.InnerText)

Question 13

Apply a CSS style to an HTML control

Answer 13

ControlName.Style[“AttributeName”] = “AttributeValue”

Question 14

• InnerHtml
• InnerText

Answer 14

• The HTML content in the control
• The text equivalent of the HTML content in the control

Question 15

Server.HtmlEncode

Answer 15

Property allowing to display an HTML element as a text element

Question 16

debug = true

Answer 16

Should be turned off when deployed to a server because it will slow down the application

Question 17

Units

Answer 17

• Unit.Pixel ()
• Unit.Percentage ()

Question 18

Color

Answer 18

• ForeColor = Color.FromArgb()
• ForeColor = Color. Crimson
• ForeColor = ColorTranslator.FromHtml()

Question 19

Padding

Answer 19

padding: top right bottom left;

Question 20

Create tables

Answer 20

• // Create a new TableRow object.
• TableRow rowNew = new TableRow();
• // Put the TableRow in the Table.
• tbl.Controls.Add(rowNew);

Question 21

HTML postback events

Answer 21

• HtmlButton.ServerClick Event
• HtmlSelect.ServerChange Event

Question 22

Web control events

Answer 22

• Click
• TextChanged
• CheckedChanged
• SelectedIndexChanged

Question 23

Autopostback

Answer 23

• Postback is done automatically as soon as the control is change
• Example:
  
  • CheckBox id=”” runat=”server” AutoPostBack=”True” OnCheckedChanged=”Check_Clicked”

Question 24

_doPostBack

Answer 24

A Javascript function that is generated automatically when at least one control uses automatic postback. Sends the eventTarget and eventArgument to the server

Question 25

Find the control ID of the sender

Answer 25

string ctrlName = ((Control)sender).ID

Question 26

• Page Load
• Page Prerender

Answer 26

• Page Load : Perform actions common to all requests, such as setting up a database query. At this point, server controls in the tree are created and initialized, the state is restored, and form controls reflect client-side data
• Prerender :Perform any updates before the output is rendered. Any changes made to the state of the control in the prerender phase can be saved, while changes made in the rendering phase are lost

Question 27

Get an enumeration of know colors

Answer 27

• string[] colorArray = Enum.GetNames(typeof(KnownColor));
• lstBackColor.DataSource = colorArray;
• lstBackColor.DataBind();

Question 28

Base ()

Answer 28

• The base keyword is used to access members of the base class from within a derived class
• Example:
  
  • public class DerivedClass : BaseClass
    
    • {
    • public DerivedClass() : base() { }
    • }

Question 29

Retaining member variables

Answer 29

Make a copy of them in the ViewState[“variableName”] during PreRender

Question 30

Placing an object in the view state

Answer 30

Add the keyword [serializable] before the class name

Question 31

Page.PreviousPage property

Answer 31

• Is used to retrieve information from the previous page
• Example:
  
  • CrossPage prevPage = PreviousPage as CrossPage;
    
    • if (prevPage != null)
    • {
      
      • lblInfo.Text += “You typed in this: “ + prevPage.FullName + “
        “;
    • }

Question 32

Url encoding

Answer 32

• UrlEncode()
• UrlDecode()
• HttpServerUtility class & Page.Server Property

Question 33

Request.QueryString

Answer 33

• The QueryString collection retrieves the values of the variables in the HTTP query string
• Syntax:
  
  • Request.QueryString(variable)[(index)|.Count]

Question 34

Cookie Class (System.Net collection)

Answer 34

• Example:
  
  • HttpCookie cookie = new HttpCookie(“preferences”)
  • Response.Cookies.Add(cookie)