Define Usage of Lock Keyword in C#

                      The lock keyword may be useful especially when you are using threading in your application. It ensures that only one thread can enter and use the critical section. If another thread needs to use the critical section, it has to wait until the previous object is released.

Application.Run in C#.Net

• The Application.Run will run the standard application message loop in the current thread where the Application runs.
• The Application.Run also takes the parameter of type Form

Descendants vs. Elements in Linq to XML

Starting with Elements(XName).
Returns a filtered collection of the child elements of this element or document, in document order.
Only elements that have a matching XName are included in the collection.
And secondly the Descendants(XName) method.
Returns a filtered collection of the descendant elements for this document or element, in document order.
Only elements that have a matching XName are included in the collection.

Use Proper Casing for Members

Identifier	Casing	Example
Class, Struct	Pascal	StrategyManager
Interface	Pascal with I prefix	IStrategy
Enumeration	Pascal	LoggingLevel
Enumeration Value	Pascal	Info
Enumeration Representing Bit Field	Pascal in plural	SearchOptions
Event	Pascal	Click
Private Field	Camel with underscore	_scheduler
Protected Field	Camel with underscore	_scheduler
Constant Field	Pascal	Pi
Constant Variable	Camel	definitionKey
Readonly Field	Camel with underscore	_listItems
Static Readonly Field	Pascal	ListValues
Variable	Camel	value
Method	Pascal	ComputeValue
Property	Pascal	Value
Parameter	Camel	parameter
Type Parameter	Pascal with T prefix	TValue
Namespace	Pascal	System.Drawing
Abbreviation with 2 and less letters	All Caps	UI, IO
Abbreviation with 3 and more letters	Pascal	Xml, Http

Use Proper Class Layout

Use the following order to position all your members inside the class. The resulting layout is the combination of all the lists provided with descending priority. That means that on the top of the file there will be all public const fields followed by internal const fields.

1.     Fields

2.     Delegates

3.     Events

4.     Properties

5.     Indexers

6.     Constructors

7.     Finalizers

8.     Methods

9.     Other stuff

Than follow access modifier.

1.     public

2.     internal

3.     protected

4.     private

After access modifier follow the type of the member.

1.     const

2.     static

3.     readonly

4.     nothing

The least significant sorting attribute is a declaration modifier.

1.     virtual

2.     abstract

3.     override

4.     new

XSLT Elements

                     The links in the "Element" column point to attributes and more useful information about each specific element.

Element	Description
apply-imports	Applies a template rule from an imported style sheet
apply-templates	Applies a template rule to the current element or to the current element's child nodes
attribute	Adds an attribute
attribute-set	Defines a named set of attributes
call-template	Calls a named template
choose	Used in conjunction with <when> and <otherwise> to express multiple conditional tests
comment	Creates a comment node in the result tree
copy	Creates a copy of the current node (without child nodes and attributes)
copy-of	Creates a copy of the current node (with child nodes and attributes)
decimal-format	Defines the characters and symbols to be used when converting numbers into strings, with the format-number() function
element	Creates an element node in the output document
fallback	Specifies an alternate code to run if the processor does not support an XSLT element
for-each	Loops through each node in a specified node set
if	Contains a template that will be applied only if a specified condition is true
import	Imports the contents of one style sheet into another. Note: An imported style sheet has lower precedence than the importing style sheet
include	Includes the contents of one style sheet into another. Note: An included style sheet has the same precedence as the including style sheet
key	Declares a named key that can be used in the style sheet with the key() function
message	Writes a message to the output (used to report errors)
namespace-alias	Replaces a namespace in the style sheet to a different namespace in the output
number	Determines the integer position of the current node and formats a number
otherwise	Specifies a default action for the <choose> element
output	Defines the format of the output document
param	Declares a local or global parameter
preserve-space	Defines the elements for which white space should be preserved
processing-instruction	Writes a processing instruction to the output
sort	Sorts the output
strip-space	Defines the elements for which white space should be removed
stylesheet	Defines the root element of a style sheet
template	Rules to apply when a specified node is matched
text	Writes literal text to the output
transform	Defines the root element of a style sheet
value-of	Extracts the value of a selected node
variable	Declares a local or global variable
when	Specifies an action for the <choose> element
with-param	Defines the value of a parameter to be passed into a template

Define Lambda Expression

Lambda Expression is a function without a name the calculates and returns single value.
Lambda Expression uses to lambda operator => [Goes To].
Syntax:

Inut Parameter) => Expression

Example:
Add Two TestBox into Form.
TxtInput and TxtOutput.

string[] arrName ={"Lakshmi",,"Narayaanan","Sriram","Suresh","Sravan","Srinath"};

Convert int? to int in C#.net

Convert int? to int in C#.net

int? v1;
int v2;
if(v1.HasValue)
v2=v1.Value

App Config File in C#.net

Read Setting Method

public static string ReadSetting(string key)
{
return ConfigurationSettings.AppSettings[key];
}

Write Setting Method

public static void WriteSetting(string key, string value)
{
XmlDocument doc = LoadConfigDocument();
XmlNode node = doc.SelectSingleNode("//appSettings");
if (node == null)
throw new InvalidOperationException("appSettings section not found in config file.");
try
{
XmlElement elem = (XmlElement)node.SelectSingleNode(string.Format("//add[@key='{0}']", key));
if (elem != null)
{
elem.SetAttribute("value", value);
}
else
{
elem = doc.CreateElement("add");
elem.SetAttribute("key", key);
elem.SetAttribute("value", value);
node.AppendChild(elem);
}
doc.Save(GetConfigFilePath());
}
catch
{
throw;
}
}

Remove Setting Method

public static void RemoveSetting(string key)
{
XmlDocument doc = LoadConfigDocument();
XmlNode node = doc.SelectSingleNode("//appSettings");
try
{
if (node == null)
throw new InvalidOperationException("appSettings section not found in config file.");
else
{
node.RemoveChild(node.SelectSingleNode(string.Format("//add[@key='{0}']", key)));
doc.Save(GetConfigFilePath());
}
}
catch (NullReferenceException e)
{
throw new Exception(string.Format("The key {0} does not exist.", key), e);
}
}

Load Config Document Method

private static XmlDocument LoadConfigDocument()
{
XmlDocument doc = null;
try
{
doc = new XmlDocument();
doc.Load(GetConfigFilePath());
return doc;
}
catch (System.IO.FileNotFoundException e)
{ throw new Exception("No configuration file found.", e);
}
}

Get Config FilePath Method

private static string GetConfigFilePath()
{
return Assembly.GetExecutingAssembly().Location + ".config";
}

Display ODD or Even using LINQ in C#.net

This is the C# Code for Find display Odd or Even Number using LINQ .

var numbers = from n in Enumerable.Range(1,25)
select new {number = n,OddEven =n %2 ==1? "odd","Even"};
foreach(var n in mubers)
{
listbox1.items.add("The Number is" ,+n.number +n.OddEven);
}

Define Dynamic Resource

The resource that are referred by using the DynamicResources markup extension are knows as Dynamic Resource.