File System Watcher in C#(Get notified after any modification)

Drag FileSystemWatcher control in your form from toolbox and add the events for created,deletion and renaming.
Ex:-
#region Designer view

this.fileSystemWatcher.EnableRaisingEvents = true;
this.fileSystemWatcher.IncludeSubdirectories = true;
this.fileSystemWatcher.SynchronizingObject = this;
this.fileSystemWatcher.Created += new System.IO.FileSystemEventHandler(this.fileSystemWatcher_Created);
this.fileSystemWatcher.Deleted += new System.IO.FileSystemEventHandler(this.fileSystemWatcher_Deleted);
this.fileSystemWatcher.Renamed += new System.IO.RenamedEventHandler(this.fileSystemWatcher_Renamed);
public System.IO.FileSystemWatcher fileSystemWatcher;

#endregion
Create three bool variables to set true or false :-
#region Properties
private bool _fileDeleted = false;
private bool _fileRenamed = false;
private bool _fileCreated = false;

public bool FileDeleted
{
set
{
_fileDeleted = value;
}
get
{
return _fileDeleted;
}
}
public bool FileRenamed
{
set
{
_fileRenamed = value;
}
get
{
return _fileRenamed;
}
}
pblic bool FileCreated
{
set
{
_fileCreated = value;
}
get
{
return _fileCreated;
}
}
#endregion

#region EventHandlers

private void fileSystemWatcher_Renamed(object sender, RenamedEventArgs e)
{
_fileRenamed = true;
MessageBox.Show(e.Name + " Renamed in " + e.FullPath);
}
private void fileSystemWatcher_Deleted(object sender, FileSystemEventArgs e)
{
_fileDeleted = true;
MessageBox.Show(e.Name + " Deleted in " + e.FullPath);
}
private void fileSystemWatcher_Created(object sender, FileSystemEventArgs e)
{
_fileCreated = true;
MessageBox.Show(e.Name + " created in " + e.FullPath);
}

#endregion

By this property if you want to check file has been removed ,deleted from physical path then this will be true and you can check like if you have a tree view and you dont want to repopulate your tree view then use filesystemwatcher and repopulate the tree only when files have been changed,delete or rename. or you can throw a messagebox like above.

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String Functionality of C# (Play with strings)

1:- Convert string to LowerCase
public static String Lower(String constantString)
{
return constantString.ToLower();
}
2:-Convert String to UpperCase
public static String Upper(String constantString)
{
return constantString.ToUpper();
}
3:- Convert String to proper case
public static String PCase(String constantString)
{
String strProper=constantString.Substring(0,1).ToUpper();
constantString=constantString.Substring(1).ToLower();
String strPrev=string.Empty;

for(int iIndex=0;iIndex < constantString.Length;iIndex++)
{
if(iIndex > 1)
{
strPrev=constantString.Substring(iIndex-1,1);
}
if( strPrev.Equals(" ") ||
strPrev.Equals("\t") ||
strPrev.Equals("\n") ||
strPrev.Equals("."))
{
strProper+=constantString.Substring(iIndex,1).ToUpper();
}
else
{
strProper+=constantString.Substring(iIndex,1);
}
}
return strProper;
}
4- Function to Reverse the String
public static String Reverse(String constantString)
{
if(constantString.Length==1)
{
return constantString;
}
else
{
return Reverse(constantString.Substring(1)) + constantString.Substring(0,1);
}
}
5- Function to Test for Palindrome
public static bool IsPalindrome(String constantString)
{
int stringLength,halfLength;
stringLength=constantString.Length-1;
halfLength=stringLength/2;
for(int iIndex=0;iIndex<=halfLength;iIndex++)
{
if(constantString.Substring(iIndex,1)!=constantString.Substring(stringLength-iIndex,1))
{
return false;
}
}
return true;
}
6- Function to get string from beginning.
public static String Left(String constantString,int iLength)
{
if(iLength>0)
return constantString.Substring(0,iLength);
else
return constantString;
}
7- Function to get string from end
public static String Right(String constantString,int iLength)
{
if(iLength>0)
return constantString.Substring(constantString.Length-iLength,iLength);
else
return constantString;
}
8:-Function to count no.of occurences of Substring in Main string
public static int CharCount(String sourceString,String stringToCount)
{
int count=0;
int position=sourceString.IndexOf(stringToCount);
while(position!=-1)
{
count++;
strSource=sourceString.Substring(position+1);
position=strSource.IndexOf(stringToCount);
}
return count;
}
9:-Convert arrayList to string[]ArrayList subKeysColletion = new ArrayList();
string[] collectionOfSubkeys = new string[subKeysColletion.Count];
collectionOfSubkeys = subKeysColletion.ToArray(typeof(string)) as string[];

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Create customize OpenFileDialogBox and SaveFileDialogBox using shell

The Open dialog box lets the user specify the drive, directory, and the name of a file or set of files to open.

The Save As dialog box lets the user specify the drive, directory, and name of a file to save.

Explorer-style Open and Save As dialog boxes provide user-interface features that are similar to the Microsoft Windows Explorer. However, the system continues to support old-style Open and Save As dialog boxes for applications that must be consistent with the old-style user interface.

In addition to the difference in appearance, the Explorer-style and old-style dialog boxes differ in their use of custom templates and hook procedures for customizing the dialog boxes. However, the Explorer-style and old-style dialog boxes have the same behavior for most basic operations, such as specifying a file name filter, validating the user's input, and getting the file name specified by the user. For more information about the Explorer-style and old-style dialog boxes, Check out in the given images.

For more information check out MSDN link :---
http://msdn.microsoft.com/en-us/library/ms646960(VS.85).aspx

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Get CSIDL Code (System Index of Directories)

const int CSIDL_DESKTOP = 0x0000; //
const int CSIDL_INTERNET = 0x0001; // Internet Explorer (icon on desktop)
const int CSIDL_PROGRAMS = 0x0002; // Start Menu\Programs
const int CSIDL_CONTROLS = 0x0003; // My Computer\Control Panel
const int CSIDL_PRINTERS = 0x0004; // My Computer\Printers
const int CSIDL_PERSONAL = 0x0005; // My Documents
const int CSIDL_FAVORITES = 0x0006; // \Favorites
const int CSIDL_STARTUP = 0x0007; // Start Menu\Programs\Startup
const int CSIDL_RECENT = 0x0008; // \Recent
const int CSIDL_SENDTO = 0x0009; // \SendTo
const int CSIDL_BITBUCKET = 0x000a; // \Recycle Bin
const int CSIDL_STARTMENU = 0x000b; // \Start Menu
const int CSIDL_MYDOCUMENTS = CSIDL_PERSONAL; // Personal was just a silly name for My Documents
const int CSIDL_MYMUSIC = 0x000d; // "My Music" folder
const int CSIDL_MYVIDEO = 0x000e; // "My Videos" folder
const int CSIDL_DESKTOPDIRECTORY = 0x0010; // \Desktop
const int CSIDL_DRIVES = 0x0011; // My Computer
const int CSIDL_NETWORK = 0x0012; // Network Neighborhood (My Network Places)
const int CSIDL_NETHOOD = 0x0013; // \nethood
const int CSIDL_FONTS = 0x0014; // windows\fonts
const int CSIDL_TEMPLATES = 0x0015;
const int CSIDL_COMMON_STARTMENU = 0x0016; // All Users\Start Menu
const int CSIDL_COMMON_PROGRAMS = 0x0017; // All Users\Start Menu\Programs
const int CSIDL_COMMON_STARTUP = 0x0018; // All Users\Startup
const int CSIDL_COMMON_DESKTOPDIRECTORY = 0x0019; // All Users\Desktop
const int CSIDL_APPDATA = 0x001a; // \Application Data
const int CSIDL_PRINTHOOD = 0x001b; // \PrintHood
const int CSIDL_LOCAL_APPDATA = 0x001c; // \Local Settings\Applicaiton Data (non roaming)
const int CSIDL_ALTSTARTUP = 0x001d; // non localized startup
const int CSIDL_COMMON_ALTSTARTUP = 0x001e; // non localized common startup
const int CSIDL_COMMON_FAVORITES = 0x001f;
const int CSIDL_INTERNET_CACHE = 0x0020;
const int CSIDL_COOKIES = 0x0021;
const int CSIDL_HISTORY = 0x0022;
const int CSIDL_COMMON_APPDATA = 0x0023; // All Users\Application Data
const int CSIDL_WINDOWS = 0x0024; // GetWindowsDirectory()
const int CSIDL_SYSTEM = 0x0025; // GetSystemDirectory()
const int CSIDL_PROGRAM_FILES = 0x0026; // C:\Program Files
const int CSIDL_MYPICTURES = 0x0027; // C:\Program Files\My Pictures
const int CSIDL_PROFILE = 0x0028; // USERPROFILE
const int CSIDL_SYSTEMX86 = 0x0029; // x86 system directory on RISC
const int CSIDL_PROGRAM_FILESX86 = 0x002a; // x86 C:\Program Files on RISC
const int CSIDL_PROGRAM_FILES_COMMON = 0x002b; // C:\Program Files\Common
const int CSIDL_PROGRAM_FILES_COMMONX86 = 0x002c; // x86 Program Files\Common on RISC
const int CSIDL_COMMON_TEMPLATES = 0x002d; // All Users\Templates
const int CSIDL_COMMON_DOCUMENTS = 0x002e; // All Users\Documents
const int CSIDL_COMMON_ADMINTOOLS = 0x002f; // All Users\Start Menu\Programs\Administrative Tools
const int CSIDL_ADMINTOOLS = 0x0030; // \Start Menu\Programs\Administrative Tools
const int CSIDL_CONNECTIONS = 0x0031; // Network and Dial-up Connections
const int CSIDL_COMMON_MUSIC = 0x0035; // All Users\My Music
const int CSIDL_COMMON_PICTURES = 0x0036; // All Users\My Pictures
const int CSIDL_COMMON_VIDEO = 0x0037; // All Users\My Video
const int CSIDL_RESOURCES = 0x0038; // Resource Direcotry
const int CSIDL_RESOURCES_LOCALIZED = 0x0039; // Localized Resource Direcotry
const int CSIDL_COMMON_OEM_LINKS = 0x003a; // Links to All Users OEM specific apps
const int CSIDL_CDBURN_AREA = 0x003b; // USERPROFILE\Local Settings\Application Data\Microsoft\CD Burning
const int CSIDL_COMPUTERSNEARME = 0x003d; // Computers Near Me (computered from Workgroup membership)
const int CSIDL_FLAG_CREATE = 0x8000; // combine with CSIDL_ value to force folder creation in SHGetFolderPath()
const int CSIDL_FLAG_DONT_VERIFY = 0x4000; // combine with CSIDL_ value to return an unverified folder path
const int CSIDL_FLAG_DONT_UNEXPAND = 0x2000; // combine with CSIDL_ value to avoid unexpanding environment variables
const int CSIDL_FLAG_NO_ALIAS = 0x1000; // combine with CSIDL_ value to insure non-alias versions of the pidl
const int CSIDL_FLAG_PER_USER_INIT = 0x0800; // combine with CSIDL_ value to indicate per-user init (eg. upgrade)

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