In my previous post i have given you a example of how to use the EntityDataReader class to get a DataTable from a LINQ query. Here i'm posing a example code to insert, Update, Delete and retrieve records using LINQ.
Below is a sample class i have used in one of my applications. You may modify the code as per your needs. Remember you need to have reference the EntityDataReader class in your application for GetContact() method to work.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using AirTouchLibrary.DomainObject;
using System.Transactions;
using Microsoft.Samples.EntityDataReader;
using System.Globalization;
namespace AirTouchLibrary.Repository
{
class ContactRepository
{
#region Variables
AirTouchDataContext airTouch;
DataTable DT;
#endregion
#region InsertContact
public string InsertContact(Contact contact)
{
try
{
airTouch = new AirTouchDataContext(ConString.DBConnection);
using (TransactionScope transaction = new TransactionScope())
{
tblContact tblcontact = new tblContact();
tblcontact.Name = contact.Name;
tblcontact.Address = contact.Address;
tblcontact.Contact = contact.ContactD;
tblcontact.AddedBy = contact.AddedBy;
tblcontact.Designation=contact.Designation;
// tblcustomer.Status = customer.status;
tblcontact.TimeStamp = DateTime.ParseExact(DateTime.Now.ToShortDateString(), "dd/MM/yyyy", DateTimeFormatInfo.InvariantInfo);
airTouch.tblContacts.InsertOnSubmit(tblcontact);
airTouch.SubmitChanges();
transaction.Complete();
return "Contact Added";
}
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
#region UpdateContat
public string UpdateContact(Contact contact)
{
try
{
airTouch = new AirTouchDataContext(ConString.DBConnection);
using (TransactionScope transaction = new TransactionScope())
{
// tblCustomer tblcustomer = new tblCustomer();
var query = (from tblcontact in airTouch.tblContacts
where tblcontact.ContactID ==contact.ContactID
select tblcontact).First();
query.Name = contact.Name;
query.Address = contact.Address;
query.Contact = contact.ContactD;
query.AddedBy = contact.AddedBy;
query.Designation=contact.Designation;
// tblcustomer.Status = customer.status;
query.TimeStamp = DateTime.ParseExact(DateTime.Now.ToShortDateString(), "dd/MM/yyyy", DateTimeFormatInfo.InvariantInfo);
airTouch.SubmitChanges();
transaction.Complete();
return "Contact Updated";
}
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
#region DeleteContatct
public string DeleteContact(int contactID)
{
try
{
airTouch = new AirTouchDataContext(ConString.DBConnection);
using (TransactionScope transaction = new TransactionScope())
{
// tblCustomer tblcustomer = new tblCustomer();
var query = (from tblcontact in airTouch.tblContacts
where tblcontact.ContactID == contactID
select tblcontact).First();
airTouch.tblContacts.DeleteOnSubmit(query);
airTouch.SubmitChanges();
transaction.Complete();
return "Contact Deleted";
}
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
#region getContat
public DataTable GetContact()
{
DT = new DataTable();
airTouch = new AirTouchDataContext(ConString.DBConnection);
DT = (from tblcon in airTouch.tblContacts
select new
{
tblcon.ContactID,
tblcon.Address,
tblcon.Name,
tblcon.Contact,
tblcon.Designation,
tblcon.AddedBy,
tblcon.Status,
tblcon.TimeStamp
}).ToDataTable();
return DT;
}
#endregion
}
}
Saturday, January 5, 2013
Insert, Update, Delete and Retrieve Example in LINQ
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