Why do I get a "CS5001: does not have an entry point defined" error when compiling?

The most common problem is that you used a lowercase 'm' when defining the Main method. The correct way to implement the entry point is as follows:class test

{

static void Main(string[] args) {}

}

What does the keyword virtual mean in the method definition?

The method can be over-ridden.


What optimizations does the C# compiler perform when you use the /optimize+ compiler option?

The following is a response from a developer on the C# compiler team:

We get rid of unused locals (i.e., locals that are never read, even if assigned).

We get rid of unreachable code.

We get rid of try-catch w/ an empty try.

We get rid of try-finally w/ an empty try (convert to normal code...).

We get rid of try-finally w/ an empty finally (convert to normal code...).

We optimize branches over branches:

gotoif A, lab1

goto lab2:

lab1:

turns into: gotoif !A, lab2

lab1:

We optimize branches to ret, branches to next instruction, and branches to branches.

How can I create a process that is running a supplied native executable (e.g., cmd.exe)?

The following code should run the executable and wait for it to exit beforecontinuing:

using System;

using System.Diagnostics;

public class ProcessTest {

public static void Main(string[] args) {

Process p = Process.Start(args[0]);

p.WaitForExit();

Console.WriteLine(args[0] + " exited.");}}

Remember to add a reference to System.Diagnostics.dll when you compile.


What is the difference between the System.Array.CopyTo() and System.Array.Clone()?


The first one performs a deep copy of the array, the second one is shallow.