12/14/07 | asp.net

Asp.net Data Adapter

Dim objAdapter as New OleDbDataAdapter("SELECT * FROM users", objConn)

Dim ds as Dataset = New DataSet()objAdapter.Fill(ds, "users")
objAdapter.TableMappings.Add("adbtable", "users")With objAdapter.TableMappings(0).ColumnMappings .Add("PID", "ID") .Add("LastName", "LName") .Add("StreetAddress", "Addy")End WithobjAdapter.Fill(ds)

VS 2008 Overview

VS 2008 JavaScript Intellisense
VS 2008 JavaScript Debugging
VS 2008 ASP.NET AJAX Control Extender Support
VS 2008 JavaScript Intellisense for Silverlight VS 2008 Web Designer and CSS Support
VS 2008 Nested Master Page Support
VS 2008 Vertical Split View Support
VS 2008 Support to Treat CSS and JavaScript Validation Issues as Warnings instead of Errors

Asp.net Sending Email with System.Net.Mail

MailMessage message = new MailMessage();
message.From = new MailAddress("sender@foo.bar.com");

message.To.Add(new MailAddress("recipient1@foo.bar.com"));
message.To.Add(new MailAddress("recipient2@foo.bar.com"));
message.To.Add(new MailAddress("recipient3@foo.bar.com"));

message.CC.Add(new MailAddress("carboncopy@foo.bar.com"));
message.Subject = "This is my subject";
message.Body = "This is the content";

SmtpClient client = new SmtpClient();
client.Send(message);

ASP.NET 3.5 Extensions CTP Preview Released

This first ASP.NET 3.5 Extensions preview release includes:
ASP.NET AJAX Improvements: New ASP.NET AJAX features in the ASP.NET 3.5 Extensions release include better browser history support (back/forward button integration, and server-side history management support), improved AJAX content linking support with permalinks, and additional JavaScript library improvements.
ASP.NET MVC: This model view controller (MVC) framework for ASP.NET provides a structured model that enables a clear separation of concerns within web applications, and makes it easier to unit test your code and support a TDD workflow. It also helps provide more control over the URLs you publish in your applications, and more control over the HTML that is emitted from them.
ASP.NET Dynamic Data Support: The ASP.NET 3.5 Extensions release delivers new features that enable faster creation of data driven web sites. It provides a rich scaffolding framework, and will enable rapid data driven site development using both ASP.NET WebForms and ASP.NET MVC.
ASP.NET Silverlight Support: With the ASP.NET 3.5 Extensions release we'll deliver support for easily integrating Silverlight within your ASP.NET applications. Included will be new controls that make it easy to integrate Silverlight video/media and interactive content within your sites.
ADO.NET Data Services: In parallel with the ASP.NET Extensions release we will also be releasing the ADO.NET Entity Framework. This provides a modeling framework that enables developers to define a conceptual model of a database schema that closely aligns to a real world view of the information. We will also be shipping a new set of data services (codename "Astoria") that make it easy to expose REST based API endpoints from within your ASP.NET applications.

Why does URL mapping and rewriting matter?

The most common scenarios where developers want greater flexibility with URLs are:
1) Handling cases where you want to restructure the pages within your web application, and you want to ensure that people who have bookmarked old URLs don't break when you move pages around. Url-rewriting enables you to transparently forward requests to the new page location without breaking browsers.
2) Improving the search relevancy of pages on your site with search engines like Google, Yahoo and Live. Specifically, URL Rewriting can often make it easier to embed common keywords into the URLs of the pages on your sites, which can often increase the chance of someone clicking your link. Moving from using querystring arguments to instead use fully qualified URL's can also in some cases increase your priority in search engine results. Using techniques that force referring links to use the same case and URL entrypoint (for example: weblogs.asp.net/scottgu instead of weblogs.asp.net/scottgu/default.aspx) can also avoid diluting your pagerank across multiple URLs, and increase your search results.

Get data in database through SqlDataAdapter (C#)

String ConnStr = "Data Source=localhost;Initial Catalog=abc;User ID=sa;Password='pw';";
String SQL = "SELECT ID, FirstName FROM Employee "
+ "WHERE ID IS NOT NULL";
SqlDataAdapter TitlesAdpt = new SqlDataAdapter SQL, ConnStr);
DataSet Titles = new DataSet();
// No need to open or close the connection
// since the SqlDataAdapter will do this automatically.
TitlesAdpt.Fill(Titles);

Matching Regular Expressions

if RegExMatch(txtPartNum.text, "^[1-9][0-9][0-9][0-9]\.[0-9][0-9]") ="False" then lblError.Text+="Part # must be in ####.## format" 'do other processingElse 'do whatever processing you need here
End If

What is the best way to output only time and not Date?

Response.Write(DateTime.Now.ToString("hh:mm:ss"));

Is it better to write code in C# or Visual Basic?

You can write code for your Web application in any language supported by the .NET Framework. That includes Visual Basic, C#, J#, JScript, and others. Although the languages have different syntax, they all compile to the same object code. The languages have small differences in how they support different features. For example, C# provides access to unmanaged code, while Visual Basic supports implicit event binding via the Handles clause. However, the differences are minor, and unless your requirements involve one of these small differences, the choice of programming language is one of personal preference. Once programs are compiled, they all perform identically; that is, Visual Basic programs run just as fast as C# programs, since they both produce the same object code.

What is an interface and what is an abstract class?

In an interface, all methods must be abstract (must not be defined). In an abstract class, some methods can be defined. In an interface, no accessibility modifiers are allowed, whereas it is allowed in abstract classes.

Describe the difference between inline and code behind.

Inline code is written along side the HTML in a page. Code-behind is code written in a separate file and referenced by the .aspx page.

What is WSDL?

WSDL is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint. Related concrete endpoints are combined into abstract endpoint

List the event handlers that can be included in Global.asax?

Application start and end event handlers
Session start and end event handlers
Per-request event handlers
Non-deterministic event handlers

Session state vs. View state

In some cases, using view state is not feasible. The alternative for view state is session state. Session state is employed under the following situations:

Large amounts of data - View state tends to increase the size of both the HTML page sent to the browser and the size of form posted back. Hence session state is used.

Secure data - Though the view state data is encoded and may be encrypted, it is better and secure if no sensitive data is sent to the client. Thus, session state is a more secure option.

Problems in serializing of objects into view state - View state is efficient for a small set of data. Other types like DataSet are slower and can generate a very large view state.

Differences Between XML and HTML?

XML User definable tags
HTML Defined set of tags designed for web display
XML Content driven
HTML Format driven
XML End tags required for well formed documents
HTML End tags not required
XML Quotes required around attributes values
HTML Quotes not required
XML Slash required in empty tags
HTML Slash not required

What is ViewState?

ViewState allows the state of objects (serializable) to be stored in a hidden field on the page. ViewState is transported to the client and back to the server, and is not stored on the server or any other external source. ViewState is used the retain the state of server-side objects between postabacks.

What is CLR, MSIL, CLS, CTS ??????????

CLR it is Common Language Runtime
It provides Services like
*Automatic Memory Management
*Thread Management
*Code Compilation & Execution
*Code Verification
*High level of security
*Structured Exception Handling
*Interoperability between Managed and Unmanaged code.

MSIL-MicroSoft INtermediate Language also called IL or CIL
It is a Language Independent
After Compiling the Source Code The CLR gives MSIL code
By using JIT compiler it converts into Native Code

CTS-Common Type System.It Provides the common data types to the compiler.

CLS-Common Language Specification.It has a set of rules to provide the Language Interaperability.And it is a subset of CTS

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