Asp.net (c #) programmer interview questions (3)

2. List several methods for passing values between ASP. NET pages.
A. 1). Use QueryString, such ....? Id = 1; response. Redirect ()....
2). Use Session Variables
3). Use Server. Transfer
3. the rules for a column are as follows: 1, 1, 2, 3, 5, 8, 13, 21, 34 ...... calculate the number of 30th digits and use a recursive algorithm.
A: public class MainClass
{
Public static void Main ()
{
Console. WriteLine (Foo (30 ));
}
Public static int Foo (int I)
{
If (I <= 0)
Return 0;
Else if (I> 0 & I <= 2)
Return 1;
Else return Foo (I-1) + Foo (I-2 );
}
}
4. What is the delegate in C? Is an event a delegate?
A:
A delegate can substitute a method as a parameter into another method.
A delegate can be understood as a reference to a function.
Yes, it is a special delegate
5. Differences between override and overload
A:
The difference between override and overload. Overload means that the method name is the same. The parameters or parameter types are different and are reloaded multiple times to meet different needs.
Override is used to Override functions in the base class. To meet your needs.
6. If you need to pass variable values in a B/S system, but you cannot use Session, Cookie, and Application, how can you handle them?
Answer: QueryString, FormsAuthentication, this. Server. Transfer
7. programmatically traverse all TextBox controls on the page and assign it a string. Empty?
A:
Foreach (System. Windows. Forms. Control control in this. Controls)
{
If (control is System. Windows. Forms. TextBox)
{
System. Windows. Forms. TextBox tb = (System. Windows. Forms. TextBox) control;
Tb. Text = String. Empty;
}
}
8. How can I program a Bubble sorting algorithm?
A:
Int [] array = new int [*];
Int temp = 0;
For (int I = 0; I <array. Length-1; I ++)
{
For (int j = I + 1; j <array. Length; j ++)
{
If (array [j] <array [I])
{
Temp = array [I];
Array [I] = array [j];
Array [j] = temp;
}
}
}
9. To describe the implementation process of the indexer in C #, can it be indexed only by numbers?
A: You can use any type.
10. Evaluate the values of the following expressions and write out one or more implementation methods: 1-2 + 3-4 + ...... + M
A:
Int Num = this. TextBox1.Text. ToString ();
Int Sum = 0;
For (int I = 0; I <Num + 1; I ++)
{
If (I % 2) = 1)
{
Sum + = I;
}
Else
{
Sum = Sum-I;
}
}
System. Console. WriteLine (Sum. ToString ());
System. Console. ReadLine ();
12. In the following example
Using System;
Class
{
Public ()
{
PrintFields ();
}
Public virtual void PrintFields (){}
}
Class B:
{
Int x = 1;
Int y;
Public B ()
{
Y =-1;
}