.Net full stack programming

What is the difference between System.String and string?

• string is used for fied-size strings in C#, while System.String is used for all the strings.

• There is no such class as System.String

• There is none—string is an alias for System. String.

• System.String is a VB.NET data type, while string is a C# type.

When break is used inside two nested for loops, does control come out of the inner for loop or the outer for loop?

• It breaks from only the outer loop.

• It breaks from all loops.

• It breaks from only the inner loop.

• It breaks from the outer loop after the second iteration.

What is a namespace?

• a group of classes, structures, interfaces, enumerations, and delegates—organized in a logical hierarchy by function that enable you to access the core functionality you need in your applications

• a group of assemblies—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications

• a group of methods—in a logical hierarchy by class—that enable you to access the core functionality you need in .NET

• a group of generic collections—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications

Which statement is true of delegates?

• Delegates are not supported in the current version of C#

• They cannot be used as callbacks

• They can be chained together.

• Only variables can be passed to delegates as parameters.

In what order would the employee names in this example be printed to the console?

string[] employees = { "Joe", "Bob", "Carol", "Alice", "Will" }; IEnumerable<string> employeeQuery = from person in employees orderby person select person; foreach(string employee in employeeQuery) { Console.WriteLine(employee); }

• First in ,first out

• Last in ,first out

• Ascending order

• unordered

What is the output of the following?

public delegate void AuthCallback(bool validUser);

public static AuthCallback loginCallback = Login;

public static void Login()

{ Console.WriteLine("Valid user!"); }

public static void Main(string[] args) { loginCallback(true); }

• Login successful

• valid user!

• an error, because the method signature of Login doesn't match the delegate

• Login successful. valid user!

What is wrong with this code?

void MyFunction() {

{ int a = 10; int b = 20; int c = a + b; }

Console.WriteLine(c);

}

• •  Variable c is never used; displaying it on the console does not count as usage.

• Variables a and b are never used.

• You cannot place code inside brackets inside another block.

• Variable c no longer exists outside the block.

Whats is ADO stand for?

Syntax for closing and opening the connection in ADO.net is _______________

• sqlConn.Open() and sqlConn.close()

• sqlConn.open() and sqlConn.Close()

• sqlConn.Open() and sqlConn.Close()

• None of the above

__________object is used to fill a DataSet/DataTable with query results in ADO.net.

• DataReader

• Dataset

• DataAdapter

• DataTables