Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your asp.net application, such as a cross-site scripting attack. You can disable ( Asp.net 2.0 ) request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. In ASP.Net 4 Please use below configuration

In the web.config file, within the <system.web> tags, insert the httpRuntime element with the attribute requestValidationMode=”2.0″.

Example:

<configuration>
<system.web>
<httpRuntime requestValidationMode=”2.0″ />
</system.web>
</configuration>

Microsoft recommends developing ASP.NET web applications in an isolated development environment. For more information on the various kinds of development environments, read the chapter ASP.NET Web Application Development Models from the article Team Development with Visual Studio .NET .

ASP.NET has introduced its five updated versions with new added features in each version.

• It was first commenced to web world with version 1.0 in 2002 with Visual Studio .NET,
• In 2003 version 1.1 with Windows Server 2003 and Visual Studio .NET 2003,
• In 2005 version 2.0 with Visual Studio 2005, Visual Web Developer Express and SQL Server 2005,
• In 2007 version 3.5 released with Windows Server 2008 and Visual Studio 2008,
• In 2008 version 3.5 service pack released with Visual Studio 2008 Service Pack 1

ASP.NET allows developers for web application development to use fully featured languages like VB.NET and C# (C-Sharp). Feature of “web services” is unique by ASP.NET, class library, XML support and complete compatibility with other programming languages.

Skipjack Come explore the many features that make Skipjack Transaction Network the leading payment gateway in North America.
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ADO.NET is the underlying data access API for .NET Framework (much like JDBC in Java). It’s been around since the first release of .NET.

LINQ to SQL is a data access framework built on ADO.NET and new language features that makes SQL Server data available natively in the object oriented style of programming. LINQ (Language-Integrated Query) and thus allowing to query data using programming language’s own syntax
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Linq IN query will pull back a set of results from SQL that is within a given range. This range can be set manually, or can itself be a query. So if you have an eCommerce application and you want to know what products you have in a given user’s cart

SQL

SELECT * FROM Product WHERE ProductID IN (SELECT ProductID FROM mycart)

Linq

List<int> itemQuery = new List<int>() {1,2,3,4};

var myProducts = from p in db.Products
                where itemQuery.Contains(p.ProductID)
                select p;

Linq To Sql only constructs the query when the Enumerator is tripped

This article recently which I thought was pretty cool. It describes how to build and use an ASP.NET Server Control that makes Google Map integration easy within ASP.NET applications:

Sending email in asp.net c# is one of the most common and reliable methods of communication for both personal and business purposes.

One of the big improvements in the configuration and maintenance of ASP.NET Web sites for version 2.0 is the ability to define common settings such as connection strings and mail server in a structured section of the web.config file

C#.net Coding Part

First add below mentioned namespace in code