Καλησπέρα σε όλους, Αυτή είναι η πρώτη μου δημοσίευση - ερώτηση. Να σας πω την αλήθεια με έπεισε το ITPRODEVCONNECTIONS 2010 , για να κάνω πιο ενεργεί τη συμμετοχή μου στην κοινότητα. Ορίστε λοιπόν το πρόβλημα μου. Φτιάχνω μία υλοποίηση ενός πολύ απλού ηλεκτρονικού καταστήματος που να δέχεται πληρωμές με κάρτες μέσω λογαριασμών ...

In this blog post I would like to talk about a new ASP.Net 4.0 feature, URL Routing . I know this issue has been explained from various people on the web but I will give my own example. We could implement routing since ASP.Net 3.5 SP1 but it was there...(read more)

This is the second post in a series of posts regarding to ADO.Net 2.0. Have a look at the first post if you like. In this post I am going to investigate the ''Disconnected'' model. When I say ''Disconnected'' I mean Datasets . Datasets are in memory representations...(read more)

I have been teaching Entity Framework,LINQ to SQL,LINQ to objects,LINQ to XML for some time now. I am huge fan of LINQ to Entities and I am using Entity Framework as my main data access technology. Entity framework is in the second version right now and...(read more)

In this post I would like to discuss in further detail the issue of track changing of entities in LINQ to SQL applications. I would like to show you how the DataContext object keeps track of all the items that are updated,deleted or inserted in the underlying...(read more)

One of the most important concepts in Object Oriented Programming is Inheritance. In this post I would like to talk about LINQ to SQL and the inheritance type that it supports which is Table per Class Hierarchy . In this type of hierarchy we have a single...(read more)

In this post I would like to talk about LINQ to SQL and transactions.When I have a LINQ to SQL class I always get asked this question, ''How does LINQ treat Transactions?''. When we use the DeleteOnSubmit() method or the InsertOnSubmit() method, all of...(read more)

As you might have guessed I am continuing my LINQ to SQL posts. I am teaching a course right now on ADO.Net 3.5 (LINQ & EF) and I know a lot of people who have learned through my blog and my style of writing. I am going to use a step by step example...(read more)

In this post I would like to talk about LINQ to SQL and its native lazy loading functionality. I will show you how you can change this behavior. We will create a simple ASP.Net application to demonstrate this. I have seen a lot of people struggling with...(read more)

In this post I would like to present a step by step example on how to use stored procedures with LINQ to SQL. Many people will wonder why I am bothering talking about LINQ to SQL so much. First of all I give a lot of seminars where people want to learn...(read more)

A friend of mine is working in an ASP.Net application and using SQL Server as the backend. He also uses LINQ to SQL as his data access layer technology. I know that Entity framework is Microsoft's main data access technology. All the money and resources...(read more)

In one of my seminars the issue of internationalisation,localisation ASP.Net applications, came up. More specifically I was asked to provide a hands-on example on how to localise an ASP.Net application. This is what I did in the class and thought to share...(read more)

Microsoft recently released a new flavor of IIS 7.x that is optimized for developer scenarios called “IIS Express” as part of WebMatrix. IIS Express combines the ease of use of the ASP.NET Web Server with the full power of IIS.  Specifically: It’s lightweight and easy to install (less than 10Mb download and a super quick install) It does ...

In one of my ASP.Net seminars I have been asked to provide a small sample/example on working with a group of custom objects. I have created a small example/site with ASP.Net & C# and thought it might be a good idea to share it with you. More specifically...(read more)

Για τον προγραμματισμό custom modules σε DNN χρειάζομαι developer με γνώσεις και υποδομή σε vb.net vs2005, vs2008. Επιπλέον γνώσεις σε HTML, CSS, jquery θεωρώ πως είναι δεδομένες. Απαραίτητη προηγούμενη 3ετης εμπειρία σε αντίστοιχη θέση. Η εργασία είναι μόνιμη και προσφέρει υψηλες αποδοχές, συνεχή εξέλιξη και προοπτικές καριέρας σε Ελλάδα αλλά ...

Γεια σας. Είμαι νέος στη σελίδα αυτή! Πρώτα απο όλα θα ήθελα να σας δώσω τα συγχαρητήρια μουγιατί ελληνική σελίδα με κατατοπιστικό  περιεχόμενο δύσκολα βρίσκεις!!Αν μπορεί κάποιος να μου απαντήσει στην ερώτηση θα του ήμουν ευγνώμων!!Εχω μία βάση δεδομένων της οποίας ένα πεδίο της είναι το path για τις αποθηκευμένες εικόνες σε ένα φάκελο ...

Καλησπέρα σε όλους,Ξεκίνησα τα πρώτα μου βήματα σε silverlight και έκανα μια μικρή εφαρμογή η οποία κάνει κλήση σε ενα service. Όταν το τρέχω τοπικά δουλεύει μια χαρά, αλλα να όμως που ήρθε και η ώρα να το ανεβάσω στον hosting server. Δεν δουλεύει και μου εμφανίζει αυτό το μήνυμα στην console του browser. Uncaught Error: Unhandled Error in ...

I guess most of you will know by now that ItPro|DevConnections is holding a lottery for two msdn subscriptions for all of those that took advantage of the early bird offer and subscribed for the event before the 30th of September. Well, I was assigned to perform the lottery which is going to take place today. This got me thinking, What would be ...

In this post we are going to see a step by step example on how to read,write,delete cookies in asp.net websites. Cookies are small pieces of text that you can associate with a website which are transfered down to the user’s computer when the user visits the website. You can use any of the versions [...]

The issue of “caching” keeps coming up in my asp.net seminars so I though it would be a good idea to write a post. I know it is a well documented feature and widely used but I really believe most people will be able to use this rather simple example and understand the concepts behind [...]

This is my second post regarding caching in asp.net applications. A friend of mine asked me if he can control caching of an asp.net page depending on the user’s language browser. Let’s see how we can accomplish that with a step by step example. You can use any of the versions of Visual studio (VS [...]

In this post I would like to talk about  Linq to Objects in an ASP.Net application. In all my classes people seem to have the following answer to this question, “What kind of data can we query with LINQ?“ Most people say “Well, we can query an SQL server database” . I am not very [...]

In this post I would like to talk about cross-page postbacks in ASP.Net. When you have a .aspx page with a button on it and you click that button the page will be posted back to the original page.

In this post I will talk about ASP.Net State management. I will provide a hands on example with VS and VB.Net. Before I go on with my example I would like to give a short introduction first. Web applications are built on Hypertext Transfer Protocol (HTTP). HTTP is a stateless protocol and each request to the server from the client is ...

In this post I would like to present you with a very simple example on how to create a simple web service that access data from a database. Then we will create a consuming application that will consume the web service. I will use VS 2010 Ultimate edition and C# as the development language.