In this post I am going to present a hands on example on how to use the Chart web server control. It is built into ASP.Net 4.0 and it is available from the Toolbox in VS 2010.It is a very rich feature control that supports many chart types, had support...(read more)

In this post I would like to continue talking about validation in ASP.Net applications. I will look into the validation controls that ASP.Net provides. You can have a look at the first post in my blog regarding validation. You will show you that we can...(read more)

I am going to start a new series of posts and I am going to cover in depth all the validation mechanisms/techniques/controls we have available in our ASP.Net applications. As many of you may know, I am a Microsoft Certified Trainer and I will present...(read more)

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)

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)

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 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 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.

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...(read more)

Last week two security researchers, Thai Duong and Juliano Rizzo, have discovered a bug in the default encryption mechanism used to protect the cookies normally used to implement Forms Authentication in ASP.NET. Using their tool (the Padding Oracle Exploit Tool or POET), they can repeatedly modify an ASP.NET Forms Authentication cookie encrypted ...

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It is a very common request when designing an asp.net application, to set the focus on an asp.net control.

Η αντιγραφή αρχείου σε NAS, προγραμματιστικά (ή εν γένει σε κάποιο UNC location εκτός τοπικού μηχανήματος) είναι μία ανάλογη διαδικασία, όπως αν το κάνουμε μέσω του UI. Θα ανοίγαμε το Run, στην συνέχεια πληκτρολογούμε το unc path. Αν σε εκείνη την τοποθεσία έχουν τεθεί permissions για όλους, τότε το παράθυρο ανοίγει κατευθείαν. Σε αντίθετη ...