Both methods can be overriden using the keywords override.

2. scroll to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

3. DefaultUserName=”your user name”

4. DefaultPassword=”Your Password”

5. AutoAdminLogon=1

That’s it. Happy Configure!

I called Dell wireless suport to resolve this frustrating issue. She tried changing power option to maximize network performance during battery charging or not charging. She also check my network card and uninstall, reinstall driver.

it took her 2 hours and she couldn’t resolve this issue. She had to escalate to level 2 support team and will call me 7AM tomorrow because she only works from 12AM to 9AM daily. 

 I personally tried ipconfig/release/renew, disable/enable network connection, uninstall ip6 and none of them seems working.

Worse case is I will roll back to Windows XP. Most of the software doesn’t support Vista anyway.

There are 2 ways to declare Nullable variable.

1. Nullable <bool> success=null;

2. bool? success=null;

if (success.hasvalue) Console.writeline(success.value)

1. It is a value type and placed on a stack (class allocated on the manage heap).

structureA tempstruct=new structureA(1,2)

strucureA tempstruct2=tempstruct.

One of the example of structure is System.Drawing.Point

When to use structure instead of class.

1. Will not be changed after creation.

2. Has an instance size less than 16bytes.

3. Logically represents a single valuye.

4. Will not be cast to a reference type.

If the value of tempstruct change, it will not affect tempstruct2 because they are allocated/pointing at different piece of memory.

2. Creates Interface when you want multiple classes to behave similary and can be used interchangebly. Interface also known as contracts, define sets of members that all classes that implement the interface must provide. Visual studio 2005 has a refactor tools that extract interface from a custom class.

3. Partial class allow you to split a class definition across multiple source file. Partial class is new in .NET 2.0 and allow developer to split their tasks. A developer can work on the same class in different files.

4. Boxing assigns a value to reference type and unboxing assigns a reference type to value type.

To create a Generic Type

Class <A,B>

{

public A a;

public B b;

public Gen(A m_a,B m_b)

{

a = m_a;

b = m_b;

}

}

To consume Generic type

Gen<string,string> genA=new Gen(“hello”,”friend”);

Limitation of using Generic class – you would limited to the capabilities of the base object class only.

To resolve this- use constraint “where”

class Gen<C>

where C:IComparable

then you can use icomparable members such as compareTo.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms; 

//FooKean.wordpress.com
namespace DelegateExample
{
    public partial class Form1 : Form
    {
        public delegate void DelegateHandler(string tempstring);
        public Form1()
        {
            InitializeComponent();
        } 

        private void Form1_Load(object sender, EventArgs e)
        {
        } 

        //Methods that has the same signature as delegatehandler
        public void DelegateMethod1(string tmpstring)
        {
            MessageBox.Show("This is delegate1. " + tmpstring);
        }
        public void DelegateMethod2(string tmpstring)
        {
            MessageBox.Show("This is delegate2. " + tmpstring);
        } 

        private void btnDelegate_Click(object sender, EventArgs e)
        {
            //Delegate holds a reference to a method
            DelegateHandler dh = new DelegateHandler(DelegateMethod1);
            dh("method1"); 

        } 

        private void btnDelegate2_Click(object sender, EventArgs e)
        {
            DelegateHandler dh = new DelegateHandler(DelegateMethod2);
            dh("method2");
        } 

        private void btnErrHandler_Click(object sender, EventArgs e)
        {
            //demonstration of multi casting.
            //point to more than one function at a time.
            //this is the best part of delegates.
            DelegateHandler dh=null;
            dh += new DelegateHandler(DelegateMethod1);
            dh +=new DelegateHandler(DelegateMethod2);
            dh("method1");
            dh("method2");
            //the output will be 4 message boxes.
            //delegate 1 method 1
            //delegate 2 method 2
            //delegate 1 method 2
            //delegate 2 method 2
            //Delegate is useful when you want to log event to a file 
            //and alert user at the same time.
        } 

    }
}

Isolated Storage is a special spot on the hard drive that only your app can find. I wrote a simple storage example program that illustrated this.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;  

using System.IO.IsolatedStorage;
using System.IO;
//Implementing write and read to storage file.
namespace IsolatedStorageExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //Button create storage file
        private void btnCreate_Click(object sender, EventArgs e)
        {
            //Create an assembly/user-level store
            //each user has its own directory and each of them has its own assembly
            IsolatedStorageFile userStore = IsolatedStorageFile.GetUserStoreForAssembly();
            //Create a file stream with a name userSettings.setting
            IsolatedStorageFileStream userStream = new IsolatedStorageFileStream("userSettings.setting", FileMode.Create, userStore);
            StreamWriter sw = new StreamWriter(userStream);
            sw.Write("This is a sample of storage.");
            sw.Close();
        }
        //Read from storage file
        //Even when if I create the storage long ago, i can still read it as
        //long as it is there. 
        private void btnRead_Click(object sender, EventArgs e)
        {
            IsolatedStorageFile userStore = IsolatedStorageFile.GetUserStoreForAssembly();
            IsolatedStorageFileStream userStream = new IsolatedStorageFileStream("userSettings.setting", FileMode.Open, userStore);
            string[] files = userStore.GetFileNames("userSettings.setting");
            if (files.Length != 0)
                foreach (String file in files)
                {
                    StreamReader sr = new StreamReader(userStream);
                    label1.Text = sr.ReadLine();
                }  

        }
    }
}

Use HybridDictionary if the lists is very large. HybridDictionary implementation is the same as hashtable, listdictionary.

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.Specialized;
using System.Collections;    

namespace SpecialCollections
{
    class Program
    {
        static void Main(string[] args)
        {
            ListDictionary gpa = new ListDictionary();
            gpa.Add("math", 4.0);
            gpa.Add("science", 4.0);
            gpa.Add("art", 4.0);
            gpa["math"] = 3.99;
            gpa["math"] = 3.89;    

            foreach(DictionaryEntry de in gpa)
            {
                Console.Write(de.Key + " score:" + de.Value);
            }
        }
    }
}