Rami Vemula

In this article, we see how to provide a download option (say for example to download images) to the users of our website. In accomplishing the requirement we use a Generic HttpHandler – which handles all the requests made for the download. For demonstration purpose we take some images and display them using a Datalist, in which we do provide an option to download. On download option click, the generic handler will process the request and displays an dialog in the client questioning client either to save or open the file, accordingly corresponding action will be taken place.

In this tutorial, we see how to develop a simple comments section. This comments section is going to be a similar one to what we usually see in our day to day experience. Here we use TinyMCE editor to enable Html Comments. And also catpcha is enabled (with the help of reCaptcha of Google). The basic outline would be – Users provide their general details like name and email, and also they can provide Html Comment (using TinyMCE), and finally they should enter the text showed in the captcha for validating robots. Then we take the Html string, encode it using HtmlEncode(), store it in database. Finally we retrieve the encoded string from the database, we then decode it and display it in the page as Comment.

In this part of the tutorial, we first create a Windows Service Project, then implement a Service called – ‘BirthdayEmailService’. Then we add a reference to our previously created Class Library – ‘EmailComponent’. We code BirthdayEmailService using Timer to perform the email sending task for every hour. Then we incorporate the Installer classes for the purpose of installation. Finally a Setup and Deployment Project is created for the Service. Finally the complete Solution is build and the exe file is generated which is ready enough to get installed.

In this tutorial, we learn how to send automated birthday wish emails to the customers of our product. We first design our database with basic details of every customer, and of course with a Email address field. Then we create a class library to hold the classes of database interactivity and to send email asynchronously. We use ADO.Net (for this tutorial I am skipping Entity Framework implementation, which usually I prefer to interact with Database. For generating EF modules of database, kindly watch this tutorial – Click Here) with a stored procedure for database interaction (primarily to fetch email ids of customers to whom we got to send birthday wishes). Then finally we use a Windows Service (which obviously run background in the server)through which the previously created class library is accessed and async emails are send.

1) In this tutorial (which is PART – II), we create a small website in ASP.Net 4.0 and we shall use a WebForm (named: PubsServiceTestPage.aspx) as a client to our service (which we created in former tutorial).
2) We Use the inline model of Webform (not the codebehind model).
3) We perform the actions using our client like, Getting all the Authors and display them in the Dropdownlist for selections, Selecting a Author and display his corresponding books using a Repeater, Modify and save the book details back to database etc.
4) To test the Client, we need the service to be running in the server, that can be simply manipulated by starting another instance of VS 2010 and running (Ctrl + F5) the PubsService.svc.cs.

1) In this tutorial we create a simple WCF service which is used to retrieve and save data from Pubs Database (Microsoft sample database).
2) The service also demos on how to use EF 4.0 and LINQ against database coding, with no requirement of writing SQL queries.
3) The continuation of this tutorial shows on how to create a client (say a WebForm in a website) to utilize this service.

validateRequest –
1. It is feature which is responsible for the page not submitting un-encoded html or script as input
in asp.net.
2. When user try to submit html or script with validateRequest enabled, asp.net throws an exception -
“A potentially dangerous Request.Form value was detected from the client”.

In most of the present day Web Applications, it is required to transfer data from one web page to another web page. Requirements like maintaining user preferences across the application, identifying user between transactions, correlating data based on previous page options etc, always drive programmers to write code to transfer data from page to page.

There are numerous ways in accomplishing the above said tasks, selecting an appropriate way for an appropriate situation is vested in the hands of programmer. Some of the most prominent techniques, out of my knowledge are listed in this article. Read More…

After writing the article on how to “Access Code-Behind variables in ASPX and JavaScript”, my focus continued on this particular counteract concept. At times we got to transfer some data from client side JavaScript to code-behind on some particular requirements. For example when the screen resolution of the client’s web browser is needed to be known in code-behind, then the simple way to accomplish is to access JavaScript variable in Code-Behind.Read More…

I often come across this question not only in the Worldwide Web but also in many development scenarios. In fact this is the question which I faced when I started programming years back. At times we need to change some of the properties of the server side controls from code-behind partial class and also sometimes we are required to process some data on the client side JavaScript which we get from code-behind. In those cases, accessing code-behind variables in ASPX is the easiest way to get our job done.Read More…