Articles by thaianhduc

Sad day

Today, i got offer from a company i took the test and passed. It seems there would be a great day. However, i feel sad. I aware of my decision. But how to be happy when i am going to say goodbye with my dear colleague and company.

There are so much memory here: Catglobe Vietnam.

After my boss sending out the final decision, i got so many chats asking why and other stuffs, we were both really sad about the decision.

There were also some arguments about my 13th salary. However, i got explanation from my boss, not totally satisfy me. But it’s ok.

I am going to finish things here and wait for new challenge in front.

My last working day at Catglobe Vietnam will be 31 Dec, 2009.

Some words

Time passed, things have changed, some issues come up, …

I am getting tired and a little bit bored. Everything seems to be fine however i am lacking of enthusiasm.

I am going to change it. Not sure it’s better or worse.

Deletion consideration

I have been working with ASP.NET for nearly 3,5 years in my company. However, i have not been using so much ASP.NET controls and other stuffs from that. My company, Catglobe Vietnam, has been built such a wonderful framework. Basically speaking, we do not need to care so much about controls and some pure ASP.NET stuffs, since we have had process for doing this. We focus much more on business logic.

Then one day, i decided to build a simple ASP.NET application, which purely uses ASP.NET stuffs. Things came a little bit for a first while. Eventually everything has been going well so far. I am going to post something about them later.

Now then, i came to a decision about deletion of an object. Let’s say a Category object, which contains Products, SubCategories.

So the category page as below:

category

So, what would happen when the button “Xóa” is clicked on each product?

Basically i had 2 options here:

  1. Process the deletion inside this page, which confirm the user and then post back to server
  2. Redirect it to another page which will take care of delete action.

( we can forget about how to delete an object since it is not the point here)

#1: We have limit information for user to see before he actually makes the decision.

#2: With the deletion page, we can show as many information as we want, with some more text confirm and warning them about the action. Furthermore, later point of time, when we decide to change the logic, information of deletion, we can easily archive it.

So, i came up with this page:

deletionpage

See, you have a certain amount of information you want to show to user.

Delete is quite serious action we always have to pay attention on.

have fun with SQL and Excel

I have been programming for more than 3 years, of course exclude the university time. Most of the time, i work with web development based on C#, ASP.NET with SQL Server. However, honestly speaking, i am not good at SQL. I just work with basic functionalities which are required to make CRUD operations.

One day, my boss gave me a task which required me to look at closely at SQL database and excel. And they were not my fields at that time, especially excel 🙁

After a couple of weeks working with requirements, i am not talking detail about the logic of task here, with the help of my boss, i have had those new things for myself, not really new for you 🙂

In summary, my task was: extract data from SQL database and format into excel file and then finally import that excel file into a new system. And the original data was not well organized and correct.

To do the extracting, i made a small window app. But the difficult thing was checking the data. Here are my steps:

  1. We have many ways to import data into SQL server. Here i work with Excel. So i import data from excel into SQL.
  2. After importing data in excel, you can customize it and make some query to get the data back
  3. Then do copy and paste the data into excel again.
  4. Make graph or any calculations to check the data again what you had so far.

The point here is that, after doing this task, i like to work with SQL and Excel more than ever. They are really nice tools.

wcf – endpoint basic

I have just finished reading about WCF – Service Endpoint basics. So what is it?

Endpoint is where consumer contacts with service. To remember about endpoint, just need to remember this: ABC of endpoint, stand for: Address, Binding, and Contract.

  1. Address: The URL of the service location: http://localhost/SomeService/Service/
  2. Binding: Define how to access the service, how to communicate with service.
  3. Contract: Define what service does

There are 2 ways of creating endpoint: by configuration and by code. Should use configuration as best practice. Since you can change it later point of time when the service is deployed without recompile the code.

Creating endpoint using configuration is quite simple. Just create a wcf library project then VS takes care of all stuffs for you 🙂

For services exposed to multiple clients, you can specify more than one endpoints so client can use the one most suitable for them. You add one more endpoint tag in configuration and make sure that the address is unique for each. If the address is the same, then the contract should be different.

Take advantage of baseAddress tag to specify the common part of the address. And again, VS already takes care of that 🙂

The default configuration generated by VS exposes meta data to the client. To turn it off set the httpGetEnabled to false.

I just wrote them down here as a way of learning it, if you do not understand or have any question, please post a comment.