Download In this article i will show how to insert,update and delete data by

LINQ - Insert,Update,Delete with LINQ to SQL
In this article i will show how to insert,update and delete data by using LINQ to SQL.
Step 1
Create a student table in database,it is look like this
Step 2
Create a console application and give the solution name as ConIUD_LINQ.
Step 3
Create a new folder inside the solution and give the folder name as ORD,it is look like
this
Click on image for better view
Step 4
Add a Linq to Sql class,Select the ORD folder,right click on Add new Item,select LINQ
to SQL classes from installed Visual Studio templates and name it StudentDC and
click on add button,it is look like this
Click on image for better view
Step 5
Open a O/R Designer by double click on StudentDC.dbml,it is look like this
Visual stdio provides an object-relational mapping designer,called the O/R Designer
which allows you to visually design the object to database mapping.
Step 6
Create a student object that will use LINQ to SQL to map to this table.go to the server
explorer,select a database,go to the tables and select Student table,it is look like this
Drag and drop Student table from Server explorer onto the design surface of the O/R
Designer,it is look like this
Step 7
Create a LinqIUD static class in a solution for insert,update and delete data to
database,it is look like this
using
using
using
using
using
System;
System.Collections.Generic;
System.Linq;
System.Text;
ConIUD_LINQ.ORD;
namespace ConIUD_LINQ
{
public static class LinqIUD
{
#region Methods
/// <summary>
/// Insert a Student Data
/// </summary>
/// <param name="StudentObj">Specify Student Object</param>
/// <returns>Boolean</returns>
public static Boolean Insert(ORD.Student StudentObj)
{
Boolean Flag = false;
try
{
// Create a object of DataContext and specify the
connectionstring in datacontext constructor
ORD.StudentDCDataContext StudentDC = new
ORD.StudentDCDataContext(System.Configuration.ConfigurationManager.Connection
Strings["ConIUD_LINQ.Properties.Settings.ABCConnectionString"].ConnectionStri
ng);
StudentDC.Students.InsertOnSubmit(StudentObj); //
the values to database for insert to the table.
passing
try
{
StudentDC.SubmitChanges(); // submit the changes to the
database
Flag = true;
}
catch (Exception)
{
Flag = false;
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return Flag;
}
/// <summary>
/// Update a Student Data
/// </summary>
/// <param name="StudentObj">Specify Student Object</param>
/// <returns>Boolean</returns>
public static Boolean Update(ORD.Student StudentObj)
{
Boolean Flag = false;
try
{
// Create a object of DataContext and specify the
connectionstring in datacontext constructor
ORD.StudentDCDataContext StudentDC = new
ORD.StudentDCDataContext(System.Configuration.ConfigurationManager.Connection
Strings["ConIUD_LINQ.Properties.Settings.ABCConnectionString"].ConnectionStri
ng);
// Select Query (Find student data by passing studentID)
var Query = from Q in StudentDC.Students where Q.StudentID ==
StudentObj.StudentID select Q;
if (Query.Count()>=1 ) // Check row count is grether than
equal to 1
{
foreach (Student Std in Query) // Pass student data into
Std Object
{
Std.StudentID = StudentObj.StudentID;
Std.FirstName = StudentObj.FirstName;
Std.LastName = StudentObj.LastName;
}
try
{
StudentDC.SubmitChanges();
// submit the changes to
the database
Flag = true;
}
catch (Exception)
{
Flag = false;
}
}
else
{
Flag = false;
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return Flag;
}
/// <summary>
/// Delete a student Data
/// </summary>
/// <param name="StudentObj">Specify Student Object</param>
/// <returns>Boolean</returns>
public static Boolean Delete(ORD.Student StudentObj)
{
Boolean Flag = false;
try
{
// Create a object of DataContext and specify the
connectionstring in datacontext constructor
ORD.StudentDCDataContext StudentDC = new
ORD.StudentDCDataContext(System.Configuration.ConfigurationManager.Connection
Strings["ConIUD_LINQ.Properties.Settings.ABCConnectionString"].ConnectionStri
ng);
// Select Query (Find student data by passing studentID)
var Query = from Q in StudentDC.Students where Q.StudentID ==
StudentObj.StudentID select Q;
if (Query.Count() >= 1) //// Check row count is grether than
equal to 1
{
foreach (Student Std in Query)
{
Std.StudentID = StudentObj.StudentID; // pass
studentID into Std Object
StudentDC.Students.DeleteOnSubmit(Std); //passing the
value to database for delete row to the table.
}
try
{
StudentDC.SubmitChanges();
the database
Flag = true;
}
catch (Exception)
{
Flag = false;
}
}
else
{
Flag = false;
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
return Flag;
}
#endregion
}
}
Step 8
Call a methods in Main function,it is look like this
using
using
using
using
System;
System.Collections.Generic;
System.Linq;
System.Text;
namespace ConIUD_LINQ
{
class Program
{
// submit the changes to
static void Main(string[] args)
{
try
{
#region Insert Section
ORD.Student StudentInsertObj = new ORD.Student();
StudentInsertObj.FirstName = "kishor";
StudentInsertObj.LastName = "naik";
if (LinqIUD.Insert(StudentInsertObj))
{
System.Console.WriteLine("Insert Sucessfully");
}
#endregion
//#region Update Section
//ORD.Student StudentUpdateObj = new ORD.Student();
//StudentUpdateObj.StudentID =1;
//StudentUpdateObj.FirstName = "kakashi";
//StudentUpdateObj.LastName = "hatake";
//if (LinqIUD.Update(StudentUpdateObj))
//{
//
System.Console.WriteLine("Update Sucessfully");
//}
//#endregion
//#region Delete section
//ORD.Student StudentDeleteObj = new ORD.Student();
//StudentDeleteObj.StudentID = 1;
//if (LinqIUD.Delete(StudentDeleteObj))
//{
//
System.Console.WriteLine("Delete Sucessfully");
//}
//#endregion
}
catch (Exception ex)
{
System.Console.WriteLine(ex.Message);
}
}
}
}
Run the project