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1. LINQ TO SQL
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2. LINQ TO SQL
Prepared By:
Nilesh R. Parmar

3.  Introduction
 How LINQ works?
 Architecture
 Underline Execution
 Execution Mode
 Why LINQ?
 LINQ to Objects
 LINQ to SQL
 Select in LINQ
 Insert in LINQ
 Update in LINQ
 Delete in LINQ
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4.  Language Integrated Query
 A set of language extensions that allows you to
perform queries without leaving the comfort of the
programming language (C# or VB)
 Defines keywords that you use to build query
expressions like select, from and where
 Select, filter, sort, group or transforms the data
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6. var contacts =
from c in customers
where c.State == "WA"
select new { c.Name, c.Phone };
var contacts =
customers
.Where(c => c.State == "WA")
.Select(c => new { c.Name, c.Phone });
ExtensionExtension
methodsmethods
LambdaLambda
expressionsexpressions
QueryQuery
expressionsexpressions
ObjectObject
initializersinitializers
AnonymousAnonymous
typestypes
Local variableLocal variable
typetype
inferenceinference
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7.  Deferred Execution
var data =
from d in ibEntity.Tourists
where d.IsIBMember == true
select d;
inMemoryData = data.ToList();
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8.  Immediate Execution
var city =
(
from c in inMemoryData
select (c.City.ToUpper())
).Distinct();
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9.  Unifies the way of accessing data from different data
sources.
 Compile-time checking of all queries, reduces run
time errors.
 Strongly typed.
 Can be applied in any project layer
(UI/Business/Data)
 Extensive Intellisence/Debugging support.
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10.  Query can be executed on collections & objects that
implements IEnumerable interface.
 LINQ queries Vs. foreach loops:
 Concise and readable, especially when filtering
multiple conditions.
 Provides powerful filtering, ordering, and
grouping capabilities with a minimum of
application code.
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11.  Query data in the SQL Server Database
 Implicitly transforms LINQ expression into a
set of SQL queries
 Advantages:
 Flexibility
 Change Tracking & Batch Updates
 Less code
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