LINQ

E-Book Details LINQ is the part of the .NET Framework that provides a generic approach to querying data from different data sources. It has quickly become the next must-have skill for .NET developers. Pro LINQ: Language Integrated Query in C# 2010 is all about code. Literally, this book starts with code and ends with code. Most books show the simplest examples of how to use a method, but they so rarely show how to use the more complex prototypes. This book is different. Demonstrating the...Read Full Story

LINQ to DataSet makes it easier and faster to the query on the data cached in a DataSet. Specifically, LINQ to DataSet simplifies the query to allow developers to write queries in the programming language itself, rather than using a separate query language. This is especially useful for Visual Studio developers who can now take advantage of syntax checking at compile time, static typing, and IntelliSense support provided by Visual Studio in their offices. LINQ to DataSet can also be used to...Read Full Story

E-Book Details LINQ is the project name for a set of extensions to the .NET Framework that provide a generic approach to querying data from different data sources. LINQ will premier in Visual Studio 2008, and will become the next must–have skill for .NET developers. For more information about LINQ, you can check out www.linqdev.com. Starting with code and ending with code and tailored for the VB language, Pro LINQ: Language Integrated Query in VB 2008 is a veritable treasury of LINQ...Read Full Story

E-Book Details Ready to take advantage of LINQ with C# 3.0? This guide has the detail you need to grasp Microsoft new querying technology, and concise explanations to help you learn it quickly. And once you begin to apply LINQ, the book serves as an on-the-job reference when you need immediate reminders. All the examples in the LINQ Pocket Reference are preloaded into LINQPad, the highly praised utility that lets you work with LINQ interactively. Created by the authors and free to...Read Full Story

Photo: Using LINQ to Objects, .NET developers can write queries over object collections with the same deep functionality that was once available only with SQL and relational databases. Now, for the first time, developers have a comprehensive and authoritative guide to applying LINQ to Objects in real-world software. Microsoft MVP Troy Magennis introduces state-of-the-art techniques for working with in-memory collections more elegantly and efficiently—and writing code that is...Read Full Story

I would like to transfer the selected rows from gridview1 to gridview2, but I am able to do only the primary key column into the second grid. How to modify the code to have all columns displayed/ is there a better way to do it? The code: protected void Button1_Click(object sender, EventArgs e) { DataClassesDataContext context = new DataClassesDataContext(); var f = from z in context.Availabilities join p in context.Items on z.ItemID equals p.ItemID join x in context.CDs on...Read Full Story

Hello, I am new to .net. So plz help resolve my errors. I have two tables Customer and CustomerAddrress. The Customer ID in the Customer table is the primary key and the CustomerID in the CustomerAddress is a foreign key to the Customer table. I have to insert value into these tabes with one submit click. The CustomerID value from the Customer table should be fetched and then this should be used in CustomerAddress table.. I am using asp along with LInq to Sql. My code is as follows...Read Full Story

Scenario: data: First Second Third I like to display it as: 1. First 2. Second 3. Third Solutions:   var list = new List<string>{ "First","Second","third" }; var query = (from s in list select s) .Select((obj, index) => index + ". " + obj); foreach (string s in query) Console.WriteLine(s); 2. static void Main(string[] args) { string[] nums = {"One","Two", "Three"}; int X = 0; var q = (from a in nums select new {ID = IncrementX(ref X), num = a}); foreach (var a in q) { Console.WriteLine (a.ID...Read Full Story

Language Integrated Query (LINQ), as well as the C# 3.0 and VB 9.0 language extensions to support it, is the most import single new feature of Visual Studio 2008 and the .NET Framework 3.x. LINQ is Ms first attempt to define a universal query language for a diverse set of in-memory collections of generic objects, entities persisted in relational database tables, and element and attributes of XML documents or fragments, as well as a wide variety of other data types, such as RSS and Atom...Read Full Story

There is no direct equivalent in LINQ. Instead you can use contains () or any other trick to implement them. Here's an example that uses Conains ().: String [] s = new String [5]; s [0] = "34"; s [1] = "12"; s [2] = "55"; s [3] = "4"; s [4] = "61";   var = RESULT1 from the day context.TableName                         where s.Contains (d.fieldname)                         select d; Eg: int[] productList = new int[] { 1, 2, 3, 4 }; var myProducts = from p in db.Products                  where...Read Full Story