.NET Mastery: May 2011

5/29/2011

What is C Sharp Using statement

The Using statement in C# allows you to define the scope of an object lifetime, when the end of the using satament is reached the object Dispose() will be called immediatly.

using (SqlConnection conn = new SqlConnection(connString))
{
     SqlCommand cmd = conn.CreateCommand();
     cmd.CommandText = "SELECT * FROM Customers";
     conn.Open();
     using (SqlDataReader dr = cmd.ExecuteReader()) {
          while (dr.Read())
          // Do Something...
     }
}

This is extremly useful when we need to release a resourece intensive object, like database connection object or a transaction scope
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5/26/2011

What is DNS

Microsoft .Net Technologies

Sharepoint 2010 ASP.net Windows blog: APS.net Dropdownlist OnSelectIndex Changed Event

5/19/2011

APS.net Dropdownlist OnSelectIndex Changed Event

The OnSelectedindexChanged event handler of ASp.net DropDownlist Control enables you to handel the click event of list items at server side that is raised at hte time when user clicks to select a list item of dropdownlist control read more

What is Active Directory

Active Directory stores information about Network Components
It allows clients to find objects within the namespace.
The term namespace refers to the area in which the network components are located
For example the table of content of a book forms a namespace in which chapters can be resolved to page numbers,
DNS is a namespace which resolves host name to IP address
Telephone book provides the namespace for resolving names to phone numbers .
Active directory provides a namespace for resolving the name of the network objects to objects themselves
Every thing that Active directory tracks is considered as an object
An object is any user,system,resource or services tracked in active directory

http://wiki.answers.com/Q/What_is_active_directory_and_how_is_it_used
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How to force uninstall a program you cannot uninstall

Click Start and choose Run in the menu (If you're using Windows Vista then press Win+R on your keyboard).
Type regedit and hit Enter.
On the left side is the registry settings tree, use it to go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
Inside that key you'll find a lot of keys that belong to different programs. Some are named after the program's name, others as a mix of numbers and letters that makes no sense. Look through each of them until you find one that has the key DisplayName (on the right) with your program's name in it.
Notice the key UninstallString - this key points to the uninstall program, and the log file usually resides in the same folder as that program.
If you delete the key in which you've found the DisplayName key with the value equal to your program's name, then your program won't appear on the Add/Remove programs list

5/18/2011

What is CAML

Collaborative Application Markuup Languae is the XML-based language that is used to build and customize web sites based on Sharepoint team Services

CAML can be used to do the following:
Provide schema definition to the web site provisioning system about how the site looks and acts
Define views and forms for data and page rendering or execution.
Pulling a value from a particular form

Why do we use CAML:
CAML allows you the ultimate flexibility and extensibility with your Web sites based on SharePoint Team Services from Microsoft. If you want to make a universal change to all the sites that you are creating within your company — for instance, you want to change the logo to match your own company logo, or you want to add an Employee ID field to your document libraries — you must use CAML to do it

Location of CAML: ( read more )

CAML Query tool :
Collaborative Application Markup Language (CAML) is an XML-based language that developers can use to create custom views and query SharePoint lists. Because it can be difficult to write anything other than basic queries, many tools have been developed to simplify this task. Several of these tools allow developers to write CAML queries within a designer. This is similar to the way developers write SQL queries for many commonly used databases.

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