Items By Type: Tutorial

Reading Excel Files Without Saving To Disk In ASP.NET

30 June 2015 14:47

ASP.NET Web Forms EPPlus

This article allows me the opportunity to demonstrate a feature of my newest favourite open source library: EPPlus. EPPlus is a .net library that reads and writes Excel 2007+ files using the Open Office Xml format (xlsx). This fantastic, easy to use (and free) library enables the use of Excel in ASP.NET applications without the need to install the Access Database Engine (ACE) or having to mess about with unsupported Office Automation on the web server (assuming you can even get Office installed there). Prompted by a rash of similar questions that appeared on the ASP.NET forums recently, this article looks at reading the contents of an uploaded Excel file without saving it, and displaying the data in a Web Forms GridView.

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Viewed 51195 times

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Entity Framework Recipe: Many To Many Relationship On The Same Table

18 June 2015 13:56

Entity Framework

This article looks at how to configure Entity Framework to manage many to many relationships based on the same table. This scenario arises the same entity is related to itself in a different role. An example is the related product feature you might see in a "People also bought" section of an ecommerce site. Another is the relationship between clients and agencies in the advertising and marketing world. That scenario will form the basis of the illustration below.

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Viewed 19531 times

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Custom TagHelpers in ASP.NET MVC 6

18 May 2015 13:45

ASP.NET MVC ASP.NET 5

TagHelpers is one of the new features introduced in MVC 6, part of ASP.NET 5. They are used for generating reusable pieces of UI that require some kind of server-side processing. I took a closer look at the built-in collection of TagHelpers in my last article, Introducing TagHelpers in ASP.NET MVC 6. This article shows how to create your own custom TagHelpers. It will illustrate two ways of doing so: through parsing custom attributes; and by binding properties on the TagHelper.

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Viewed 14634 times

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Introducing TagHelpers in ASP.NET MVC 6

11 May 2015 13:17

ASP.NET MVC ASP.NET 5

TagHelpers is one of the new features introduced in MVC 6. The TagHelper's role is similar to the one played in previous versions of ASP.NET MVC by HtmlHelpers: they are designed to simplify the work required to author views that need to respond dynamically to the data provided to them. However, the way in which they work and their impact on view design is very different to HtmlHelpers.

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Viewed 40022 times

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Using the HtmlAgilityPack to parse HTML in ASP.NET

30 April 2015 13:26

HTML General HTML5

Hardly a week goes by without someone asking a question in the ASP.NET forums about parsing HTML for one purpose or another. Mostly, the questions are couched in terms of 'finding values' or similar, prompting responses from the community that recommend one regular expression pattern or another, treating HTML as a string of text with no structure or rules. In fact, HTML is a structured document format with a set of very clearly defined rules, which means that it can easily be parsed given the right tool. My favourite tool for parsing HTML is the HtmlAgilityPack.

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Viewed 63866 times

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Entity Framework Recipe: Storing And Managing Time

23 April 2015 13:19

ASP.NET MVC Entity Framework

This post explores the options available to you when your application requirements include managing and storing time using the Entity Framework. Specifically, I am thinking of durations of time, such as the time required to complete some kind of task, not the time part of a date. Relevant examples might include storing the length of a movie, or the preparation time required for a recipe.

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Viewed 7989 times

3 Comments for this item

7 C# 6.0 Features That Every ASP.NET Developer Should Know About

14 April 2015 13:25

C# ASP.NET 5

Visual Studio 2015 introduces a completely new version of ASP.NET, but it also includes version 6 of the C# language. Previous new versions of C# have heralded substantial changes like the introduction of async and await in version 5, dynamic in version 4, LINQ in version 3 and so on. There are no major feature changes or introductions in version 6, but there are a number of syntactical improvements that you are likely to use on a daily basis. Here's a rundown of them.

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Viewed 37663 times

19 Comments for this item

Sessions in ASP.NET Core

07 April 2015 13:39

ASP.NET MVC ASP.NET 5 ASP.NET Core

ASP.NET Core is being designed so that your application is only dependent on features that it actually needs. This is achieved in large part by creating a composable framework, where the developer opts in to non-essential features - a number of which are baked in to traditional versions of ASP.NET. One of the features that this applies to is Session State. This article looks at how to obtain and use session state in ASP.NET Core applications.

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Viewed 72505 times

19 Comments for this item

ASP.NET 5 Middleware, Or Where Has My HttpModule Gone?

31 March 2015 13:22

ASP.NET MVC ASP.NET 5

ASP.NET 5 has been largely rewritten from the ground up, and incorporates some radical changes when compared with previous versions of ASP.NET. One of the biggest changes is in the HTTP Pipeline. This article looks at how those changes impact the design and registration of plug and play components that used to be represented by HttpModules.

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Viewed 44736 times

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How To Send Email In ASP.NET MVC

24 March 2015 13:21

ASP.NET MVC

This article takes a comprehensive look at the business of generating and sending email from an ASP.NET MVC application. It covers the most common use cases as well as some advanced scenarios. It also explores some of the more common errors that arise from attempting to generate and send email programmatically from an ASP.NET MVC site.

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Viewed 163900 times

49 Comments for this item

ASP.NET 5 By Numbers

16 March 2015 13:20

ASP.NET MVC ASP.NET Web Pages ASP.NET 5

There's a lot of confusion surrounding the numbers relating to the impending release of the next version of ASP.NET. This post takes a look at the main ones and seeks to explain their significance.

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Viewed 11615 times

4 Comments for this item

Error Handling in ASP.NET Razor Web Pages

10 March 2015 13:07

ASP.NET Web Pages WebMatrix

Bang! An unhandled exception occurred during the execution of the current web request. And that's it - your visitor is met with the yellow screen of death and they are left wondering what they did wrong. You might not even be aware of what's just happened - unless your visitor can find some way of alerting you, oh, and they bother to do so. That's the problem with run time errors; the code worked fine when you ran it on your machine. But then along came a user and they tried to do something you didn't anticipate and broke your site. So what should you do about this?

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Viewed 17046 times

1 Comment for this item

ASP.NET MVC DropDownLists - Multiple Selection and Enum Support

03 March 2015 13:26

ASP.NET MVC

My original article about Drop Down Lists in ASP.NET MVC has proven to be among the most popular on this site, amassing over a third of a million views since it was published 5 years ago. This article builds on the original by looking at using drop down lists for multiple selections, and the helper that was introduced in MVC 5.1 to support enumerations as a source of select options.

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Viewed 170154 times

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Migrating From Razor Web Pages To ASP.NET MVC 5 - Model Binding And Forms

24 February 2015 14:51

ASP.NET MVC ASP.NET Web Pages

If you have built sites with the ASP.NET Razor Web Pages framework, you might want to look at migrating them to ASP.NET MVC at some point. This tutorial is the last in a series of three that explores how you do that by taking a step by step approach to migrating the WebMatrix Bakery template site to ASP.NET MVC 5. Previous tutorials in the series have looked at the roles of the View and Controller, and the data access and view model aspects of the Model. This final part covers model binding and form posting. A download (c. 24MB) featuring the completed application is available on GitHub.

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Viewed 33726 times

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Migrating From Razor Web Pages To ASP.NET MVC 5 - Data Access And View Models

18 February 2015 13:16

ASP.NET MVC Entity Framework ASP.NET Web Pages

If you have built sites with the ASP.NET Razor Web Pages framework, you might want to look at migrating them to ASP.NET MVC at some point. This tutorial is the second in a series of three that explores how you do that by taking a step by step approach to migrating the WebMatrix Bakery template site to ASP.NET MVC 5. Along the way, each of the core parts of MVC are discussed by way of an introduction to the framework. The tutorial is divided into three parts. The first part looked at the roles of the View and Controller. This part looks at the M in MVC, the Model. Specifically, it features data access and view models. The final part will cover model binding and form posting. A download (c. 24MB) featuring the completed application is available on GitHub.

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Viewed 13883 times

2 Comments for this item

Recent Comments

Obinna Okafor 26/05/2017 16:16
In response to Razor Pages - The Elevator Pitch
Thank you for this wonderful piece, Mike. I need more of these...Keep them coming - anything more...

Cyrus 26/05/2017 06:00
In response to Razor Pages - The Elevator Pitch
There are some concern about razor pages performance. Is it faster or slower than MVC? would you a a...

Cyrus 26/05/2017 05:44
In response to Razor Pages - Understanding Handler Methods
well done, thank you....

Satyabrata Mohapatra 23/05/2017 11:41
In response to Razor Pages - Understanding Handler Methods
Nice and easy !! Great post....

Cyrus 16/05/2017 19:55
In response to Razor Pages - Getting Started With The Preview
There is something wrong related to microsoft.dotnetcore.mvc.taghelpers! if you remove it from page...

Cyrus 16/05/2017 10:18
In response to Razor Pages - Getting Started With The Preview
well done mike, it was very useful, I really appreciate that....

Satyabrata Mohapatra 16/05/2017 07:21
In response to Razor Pages - Getting Started With The Preview
Finally!!!! web pages in asp.net core!!! Super excited !!!! Thank u sir for sharing.....Awaiting on...

Daniele 14/03/2017 10:24
In response to Working With Zip Files In ASP.NET MVC
is it possible give to the user a progress bar of the zipping process? Thanks in advance. ...

Suraj 13/03/2017 22:20
In response to Working With Zip Files In ASP.NET MVC
Very nice article. Thanks....

Satyabrata Mohapatra 19/02/2017 03:01
In response to Free SSL Certificates On IIS With LetsEncrypt
Thanks for sharing. Learned a lot !!...