Nikolaos Kantzelis ASP.Net Blog

How to move the ViewState from a hidden field on the client to a session on the server

2011-12-30T20:12:00Z

This is a post relevant to all the developers out there that use Web Forms as their main ASP.Net platform. In this post I would like to talk about ViewState and how we can move it and store it in a session on the server's memory. We know that the default hidden client field for ViewState can become very large on pages.That can problematic in terms of SEO and performance. Let's talk a little bit about ViewState since not everybody knows what it is and why we need it. We need those state preserving...(read more)

Adding search functionality in a GridView in an ASP.Net application

2011-12-28T20:06:00Z

In my seminars I always show how to fetch data from an SQL Server database to some UI controls (usually a GridView control). I use the connected data access model,I use the disconnected data access model (datasets) and obviously I provide samples that leverage LINQ to SQL and Entity Framework . Sometimes I get asked how to search through the results that are bound to a GridView control. In this post I would like to show you how to get data from an SQL Server database and bind the data to a Gridview...(read more)

Create an Ajax enabled WCF service and invoking it using client-side code

2011-12-28T15:45:00Z

In this post I would like to show you again with a hands-on example how to create an Ajax enabled WCF Service and invoke it using the Ajax Script Manager web server control. This is going to be a very simple example and it is for people who are not familiar with WCF and in general with SOA architecture. My main concern here is to show how you can invoke that service (service method) using client side code. In a later post I will show you something similar using JQuery . Let's move on with our hands...(read more)

Using JQuery to call a WCF Service in an ASP.Net application

2011-12-26T22:22:00Z

In this post I would like to show you with a hands-on example how to invoke a WCF service from JQuery . I have already posted a few posts regarding JQuery and server communication.Have a look in this post and in this post . This is a similar post . In order to follow what I am about to say in this post, I assume that you know what JQuery is and have a basic understanding of how to traverse the DOM or handle events with JQuery. You can find more posts regarding JQuery by clicking here . So we can...(read more)

Using Audio and Video in HTML 5

2011-12-26T00:03:00Z

This is the second post in the new HTML 5 post series. You can find the first post about HTML 5 input form elements and validation here . In this post I would like to show you how to use audio and video.We all know that audio and video are everywhere on the web nowadays and are part of the web experience in many sites. This is a new way of adding audio and video (new html elements) with HTML 5 which does not require any plugins.We can have audio and video playing natively in the browser. Since the...(read more)

Using HTML 5 form input elements in ASP.Net applications

2011-12-24T13:26:00Z

I am going to start a new series of posts that focus on HTML 5. HTML 5 is something I wanted to learn and finally I have covered enough ground to feel confident. HTML 5 gives us things like Semantic tags, the possibility to add video and audio in our pages without any plugins.With Canvas we can have very rich animations to our web pages. I see that now with all these emerging technologies there are many things you can do on the client. JQuery is amazing and you can do so many things. Please have...(read more)

Looking into Web performance in ASP.Net applications

2011-12-08T17:29:00Z

In these series of posts I am going to have a look into the various factors that make our web applications slower and how we can rectify that. Ι have already blogged about caching in this blog and you can find these blog posts below Caching an ASP.Net page Data caching in ASP.Net applications How to cache an asp.net page depending on the user's browser language Caching is very important and vast topic and I might talk more in depth about this issue in future blog posts.Certainly with caching you...(read more)

Performing Validation using the JQuery Validation library/plugin

2011-11-28T15:16:00Z

This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here In this post I would like to show you how to perform client-side validations using the JQuery validation plugin. Some basic level of knowledge of JQuery is assumed. Sadly, we canot cover the basics of JQuery in this post so here are a few resources for you to focus on The main site is this http://blog.jquery.com/ http://docs.jquery...(read more)

Creating a simple watermark effect using JQuery

2011-11-24T18:37:00Z

This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here In this post I would like to show you how to create a simple watermark effect using JQuery.Watermark is a great way to provide users with informarion without using more space on the screen. Some basic level of knowledge of JQuery is assumed. Sadly, we canot cover the basics of JQuery in this post so here are a few resources for you...(read more)

Creating a simple accordion with JQuery

2011-11-24T16:16:00Z

This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here We all know that there is always a limited space in our web page to show content.In this example I would like to show you how to create an accordion "effect" on a simple .aspx page. Some basic level of knowledge of JQuery is assumed. Sadly, we canot cover the basics of JQuery in this post so here are a few resources for you to focus...(read more)

Creating a simple slider panel with JQuery

2011-11-23T21:48:00Z

This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here We all know that there is always a limited space in our web page to show content.In this example I would like to show you how to create a slider panel that the users of your site can slide down so they can see the content. Some basic level of knowledge of JQuery is assumed. Sadly, we canot cover the basics of JQuery in this post so...(read more)

Creating custom error pages in ASP.Net applications

2011-09-24T19:05:00Z

This is going to be another short post regarding ASP.Net and custom error pages. Our goal is to specify a particular page to be displayed on the user's screen when error occurs within our application.In order to that we basically have to make some changes in the web.config file. 1) Launch Visual Studio and create a new ASP.Net web application from the available projects. 2) Let's create the generic error page. Add another item to your project , an .htm page. I have named it GenericError.htm Add some...(read more)

Take an ASP.Net application offline

2011-09-24T15:30:00Z

In this post (it is going to be very short for a change) I would like to show you how to take your ASP.Net application offline. We have to place a file named app_offline.htm into your root directory.By doing that we stop any ASP.Net processing. If you wonder what is going to be displayed instead, are the contents of the app_offline.htm. If we remove the app_offline.htm or rename it, then the ASP.Net application will start again. 1) Launch Visual Studio and create a new ASP.Net web application.Give...(read more)

An introduction to ASP.Net health monitoring and web events

2011-09-20T21:26:00Z

In this post I would to focus on ASP.Net Health monitoring and Web events.Health monitoring is another mechanism to capture/abstract logging. In most cases with our ASP.Net applications we need to trace what happens when they are up and running. Have a look at a previous post of mine where I talk about Tracing at page and application level. In this post I would like to talk about Web events. The web event represents the data that is to be logged.We can raise those events and those events can be logged...(read more)

Using JQuery Ajax functions to retrieve data from the server

2011-09-14T11:15:00Z

In this post I would like to talk about the great support that JQuery has for Ajax.I have already written another post on my blog regarding the Jquery Ajax functions and how we can get data form the server.In that post we looked into how we can use the load() method to get data from the server.One of the things you must keep in mind is that JQuery is able to communicate with any server that uses standard protocols.In this post I would like to talk about the get() , post() and ajax() methods and how...(read more)