Asp.net Databind With Linq & linq to Sql

Introduction

LINQ: .NET Language-Integrated Query

After two decades, the industry has reached a stable point in the evolution of object-oriented (OO) programming technologies. Programmers now take for granted features like classes, objects, and methods. In looking at the current and next generation of technologies, it has become apparent that the next big challenge in programming technology is to reduce the complexity of accessing and integrating information that is not natively defined using OO technology. The two most common sources of non-OO information are relational databases and XML.

Rather than add relational or XML-specific features to our programming languages and runtime, with the LINQ project we have taken a more general approach and are adding general-purpose query facilities to the .NET Framework that apply to all sources of information, not just relational or XML data. This facility is called .NET Language-Integrated Query (LINQ).

We use the term language-integrated query to indicate that query is an integrated feature of the developer's primary programming languages (for example, Visual C#, Visual Basic). Language-integrated query allows query expressions to benefit from the rich metadata, compile-time syntax checking, static typing and IntelliSense that was previously available only to imperative code. Language-integrated query also allows a single general purpose declarative query facility to be applied to all in-memory information, not just information from external sources.

.NET Language-Integrated Query defines a set of general purpose standard query operators that allow traversal, filter, and projection operations to be expressed in a direct yet declarative way in any .NET-based programming language. The standard query operators allow queries to be applied to any IEnumerable-based information source. LINQ allows third parties to augment the set of standard query operators with new domain-specific operators that are appropriate for the target domain or technology. More importantly, third parties are also free to replace the standard query operators with their own implementations that provide additional services such as remote evaluation, query translation, optimization, and so on. By adhering to the conventions of the LINQ pattern, such implementations enjoy the same language integration and tool support as the standard query operators.

The extensibility of the query architecture is used in the LINQ project itself to provide implementations that work over both XML and SQL data. The query operators over XML (LINQ to XML) use an efficient, easy-to-use, in-memory XML facility to provide XPath/XQuery functionality in the host programming language. The query operators over relational data (LINQ to SQL) build on the integration of SQL-based schema definitions into the common language runtime (CLR) type system. This integration provides strong typing over relational data while retaining the expressive power of the relational model and the performance of query evaluation directly in the underlying store.

Object Relational Designer (O/R Designer)

The Object Relational Designer (O/R Designer) provides a visual design surface for creating LINQ to SQL entity classes and associations (relationships) that are based on objects in a database. In other words, the O/R Designer is used to create an object model in an application that maps to objects in a database. It also generates a strongly-typed DataContext that is used to send and receive data between the entity classes and the database. The O/R Designer also provides functionality to map stored procedures and functions to DataContext methods for returning data and populating entity classes. Finally, the O/R Designer provides the ability to design inheritance relationships between entity classes.

Step by Steps

1    open Vs 2008 and Create new website

2    Drag n Drop on Form Button and GridView Control From ToolBar

3    set there id girdView to Gvlinq and Button1 to btnbinding

4    Right Click on Solution Explorer click on Add newitem and Select linq to sql

5    Open Server Explorer and Drag and drop any table form Database if u did`nt Created at yat so Sample database is available in Sorcecode copy from there

6    goback to default.aspx and double Click on button and write code blow

protected void BtnBind_Click(object sender, EventArgs e)
        {
            DataClasses1DataContext db = new DataClasses1DataContext();
            var qury = from c in db.Public_Registrations
                       select c;

            GvLinq.DataSource = qury;
            GvLinq.DataBind();
        }

The Complete code of Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace myLinqDatabinding
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void BtnBind_Click(object sender, EventArgs e)
        {
            DataClasses1DataContext db = new DataClasses1DataContext();
            var qury = from c in db.Public_Registrations
                       select c;

            GvLinq.DataSource = qury;
            GvLinq.DataBind();
        }
    }
}

Sample Project Source

Download source files -1333 kb