.NET WebDev interview questions
9. How will you identify which event in the ASP.NET Web page life cycle takes the longest time to execute? A. Turn on ASP.NET trace and run the Web application. B. Add a few code to each of the page life-cycle events that will print the current time. C. In the Web.config file, add the monitorTimings attribute and set it to True. D. In the Web site properties, turn on the performance monitor and run the Web application. After that, open performance monitor to see the timings.
11. You are interested in examining the data that is posted to the Web server. What trace result section can you use to see this information?A. Control Tree B. Headers Collection C. Form Collection D. Server Variables
12. While creating web site you need to add an HTML Web server control to the Web page, you need to drag an HTML element from the ToolBox of Visual Studio 2005 to the Web page and then which of the following tasks you will perform? A. Right-click the HTML element and click Run=Server. B. Double-click the HTML element to convert it to an HTML server control. C. Right-click the HTML element and click Run As Server Control. D. Click the HTML element and set ServerControl to true in the Properties window.
13. While testing your ASP.NET web application you noticed that while clicking on CheckBox of one of the web page it does not cause a PostBack; you required that the CheckBox should make PostBack so Web page can be update on the server-side code. How can you make the CheckBox to cause a PostBack? A. Set the AutoPostBack property to true. B. Add JavaScript code to call the ForcePostBack method. C. Set the PostBackAll property of the Web page to true. D. Add server-side code to listen for the click event from the client.
14. While writing code in Visual Studio 2005 you creates a new instance of a ASP.NET TextBox server control, what do you need to do to get the TextBox to display on the Web page? A. Call the ShowControl method on the TextBox. B. Set the VisibleControl to true on the TextBox. C. Add the TextBox instance to the form1.Controls collection. D. Execute the AddControl method on the Web page.
15. While creating your ASP.NET web based application you want to create multiple RadioButton server controls which should be mutually exclusive, what property of RadioButton server controls you must set? A. Exclusive B. MutuallyExclusive C. Grouped D. GroupName
16. While creating an ASP.NET web application with the help of Visual Studio 2005 you are creates a Web page that has several related buttons, such as fast-forward, reverse, play, stop, and pause. There should be one event handler that handles the processes of PostBack from these Button server controls. Other than the normal Submit button, what type of button can you create? A. OneToMany B. Command C. Reset D. ManyToOne
ASP.NET 2.0 Interview Questions
1. What is the name of the property of ASP.NET page that you can query to determine that a ASP.NET page is being requested not data being submitted to web server? A. FirstGet B. Initialized C. IncludesData D. IsPostBack
IsPostBack
2. While creating a Web site with the help of Visual Studio 2005 on a remote computer that does not have Front Page Server Extensions installed, which Web site type will you create in Visual Studio 2005? A. Remote HTTP B. File C. FTP D. Local HTTP
Hypertext Transfer Protocol (HTTP)
3. If you want to create a new Web site with the help of Visual Studio 2005 on a Web server that is hosted by your ISP (Internet Services provider) and the Web server has Front Page Server Extensions installed, what type of Web site type would you create in Visual Studio 2005? A. Local HTTP B. File C. FTP D. Remote HTTP
Hypertext Transfer Protocol (HTTP)
4. For separating server-side code from client-side code on a ASP.NET page, what programming model should you use? A. Separation model B. Code-Behind model C. In-Line model D. ClientServer model
5. Amit created a new Web site using Visual Studio 2005 in programming language C#. Later, Amit received an existing Web page from his boss, which consisted of the Contact.aspx file with the Contact.aspx.vb code-behind page. What must Amit do to use these files? A. Amit can simply add the files Contact.aspx, Contact.aspx.vb into the existing Web site, because ASP.NET 2.0 supports Web sites that have Web pages that were programmed with different languages. B. The Contact.aspx file will work, but Amit must rewrite the code-behind page using C#. C. Both files Contact.aspx and Contact.aspx.vb must be rewritten in C#. D. Amit must create a new Web site that contains these files Contact.aspx and Contact.aspx.vb. Set a Web reference to the new site.
6. If you want to make a configuration setting change in your server that will affect to all Web and Windows applications on the current machine. Where you will make the changes? A. Global.asax B. Web.config C. Machine.config D. Global.asax
7. If you want to make a configuration setting change that will affect only the current Web application. Which file will you change? A. Web.config that is in the same folder as the Machine.config file B. Web.config in the root of the Web application C. Machine.config D. Global.asax
8. For making a configuration setting change that will affect only the current Web application. Is there any tool that has a user-friendly Graphical User Interface (GUI)? A. The Microsoft Management Utility B. Microsoft Word C. Visual Studio, using the Tools > Options path D. Web Site Administration Tool
Whats the difference betweeen Structure, Class and Enumeration
Structures and Enumerations are Value-Types. This means, the data that they contain is stored as a stack on the memory. Classes are Reference-Types, means they are stored as a heap on the memory.
Structures are implicitly derived from a class called System.ValueType. The purpose of System.ValueType is to override the virtual methods defined by System.Object. So when the runtime encounters a type derived from System.ValueType, then stack allocation is achieved. When we allocate a structure type, we may also use the new keyword. We may even make a constructor of a structure, but, remember, A No-argument constructor for a structure is not possible. The structure's constructor should always have a parameter.
So if we define the following structure
struct MyStruct
{
public int y,z;
}
and we create a structure type
MyStruct st = new MyStruct();
In case of a class, no-argument constructors are possible. Class is defined using the class keyword.
A struct cannot have an instance field, whereas a class can.
class A
{
int x = 5; //No error
...
}
struct
{
int x = 5; //Syntax Error
}
A class can inherit from one class (Multiple inheritance not possible). A Structure cannot inherit from a structure.
Enum is the keyword used to define an enumeration. An enumeration is a distinct type consisting of a set of named constants called the enumerator list. Every enumeration has an underlying type. The default type is "int". Note: char cant be the underlying data type for enum. First value in enum has value 0, each consequent item is increased by 1.
enum colors {red, green, blue, yellow};
Here, red is 0, green is 1, blue is 2 and so on.
An explicit casting is required to convert an enum value to its underlying type
int x = (int)colors.yellow;
Whats the difference betweeen Structure, Class and Enumeration
Structures and Enumerations are Value-Types. This means, the data that they contain is stored as a stack on the memory. Classes are Reference-Types, means they are stored as a heap on the memory.
Structures are implicitly derived from a class called System.ValueType. The purpose of System.ValueType is to override the virtual methods defined by System.Object. So when the runtime encounters a type derived from System.ValueType, then stack allocation is achieved. When we allocate a structure type, we may also use the new keyword. We may even make a constructor of a structure, but, remember, A No-argument constructor for a structure is not possible. The structure's constructor should always have a parameter.
So if we define the following structure
struct MyStruct
{
public int y,z;
}
and we create a structure type
MyStruct st = new MyStruct();
In case of a class, no-argument constructors are possible. Class is defined using the class keyword.
A struct cannot have an instance field, whereas a class can.
class A
{
int x = 5; //No error
...
}
struct
{
int x = 5; //Syntax Error
}
A class can inherit from one class (Multiple inheritance not possible). A Structure cannot inherit from a structure.
Enum is the keyword used to define an enumeration. An enumeration is a distinct type consisting of a set of named constants called the enumerator list. Every enumeration has an underlying type. The default type is "int". Note: char cant be the underlying data type for enum. First value in enum has value 0, each consequent item is increased by 1.
enum colors {red, green, blue, yellow};
Here, red is 0, green is 1, blue is 2 and so on.
An explicit casting is required to convert an enum value to its underlying type
int x = (int)colors.yellow;
What is the difference between Shared and Static?
They both mean the same. Shared is used in VB.NET. Static is used in C#.
When the static keyword is used to declare a class, the member in context must be directly invoked from the class, rather than from the instance. Consider the following example
//Consider writing the following line of code...
Console obj = new Console();
obj.Writeline("Vishal likes static members"); //This line does'nt print
//This does'nt work, because WriteLine is a static method defined in the class Console
//The Console class is a static class
To use static members, give a reference to the exact class, as an instance in this case won't work.
To make this work, write...
Console.Writeline("Vishal likes static members");
To work with members of static classes, no need to create their instances.
Static Member - A class member declared with the keyword static is a static member. A static member is owned by the class, not by its instances (objects of the class).
Note that static members are actually class members, while non-static members are instance members (means they are owned by the instances). Both in C# & VB.NET, we may create static/shared events, properties, fields and functions.
Note Indexers in C# cannot be declared static.
Note Static member functions cannot access non-static members directly.
What is the difference between String and StringBuilder?
Both String and StringBuilder are classes used to handle strings.
The most common operation with a string is concatenation. This activity has to be performed very efficiently. When we use the "String" object to concatenate two strings, the first string is combined to the other string by creating a new copy in the memory as a string object, and then the old string is deleted. This process is a little long. Hence we say "Strings are immutable".
When we make use of the "StringBuilder" object, the Append method is used. This means, an insertion is done on the existing string. Operation on StringBuilder object is faster than String operations, as the copy is done to the same location. Usage of StringBuilder is more efficient in case large amounts of string manipulations have to be performed.
What is the difference between Server.Transfer and Server.Execute?
Both Server.Transfer and Server.Execute were introduced in Classic ASP 3.0 (and still work in ASP.NET).
When Server.Execute is used, a URL is passed to it as a parameter, and the control moves to this new page. Execution of code happens on the new page. Once code execution gets over, the control returns to the initial page, just after where it was called. However, in the case of Server.Transfer, it works very much the same, the difference being the execution stops at the new page itself (means the control is'nt returned to the calling page).
In both the cases, the URL in the browser remains the first page url (does'nt refresh to the new page URL) as the browser is'nt requested to do so.
.NET interview: What is the difference between a Thread and Process?
A process is a collection of virtual memory space, code, data, and system resources. A thread is code that is to be serially executed within a process. A processor executes threads, not processes, so each application has at least one process, and a process always has at least one thread of execution, known as the primary thread. A process can have multiple threads in addition to the primary thread. Prior to the introduction of multiple threads of execution, applications were all designed to run on a single thread of execution.
When a thread begins to execute, it continues until it is killed or until it is interrupted by a thread with higher priority (by a user action or the kernel’s thread scheduler). Each thread can run separate sections of code, or multiple threads can execute the same section of code. Threads executing the same block of code maintain separate stacks. Each thread in a process shares that process’s global variables and resources.
