ASP.NET Core, Blazor, .NET, Azure, SharePoint, IoT
One cool feature of C# 3.0 is support of anonymous types. Let’s suppose we have to create some data structure and we need this structure in one place in one method. This far we had to create a new private class or structure. With anonymous types we don’t have to define new type – we can create it on the run.
Read moreC# 3.0 introduced us new language feature: type inference using keyword var. Some guys think that var in C# is same thing as var in PHP. That’s wrong – var keyword in C# is totally different thing and it doesn’t mean that C# has now support for type changing class attributes. Let’s prove it.
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This is the first posting of Beginners section of this blog. I will put here code samples that are not advanced enough to put them elsewhere in this blog. First example shows how to filter one dropdown list based on value selected from another.
Read moreOnce I wrote a class to make paging calculations. I had some data bound user controls that had no paging support. So I had to improvise. As it is was pointless to duplicate pager code to every user control where I needed paging I wrote a class to make my life easier.
Read moreGetting distinct values from arrays is not a unique problem. Here will I show some options how to do it. We are will use array of integer in examples here. This blog entry shows you somehow the mighty evolution of .Net Framework.
Read moreSharePoint list items have a tricky way how to assign values to DateTime fields in your code. It is possible to assign value of DateTime type to this field but it also possible to assign a string. This string is a little bit mysterious. You may get errors with one dates but some dates will work perfect. So what’s the trick?
Read moreASP.NET Futures introduced support for search engine sitemaps. This is content detection protocol introduced originally by Google and later accepted also by Microsoft and Yahoo! ASP.NET makes sitemaps generating easy for us and as a bonus their model is perfect for more complex web applications like e-commerce and e-services sites. Let’s see now what we can do.
Read moreI just putted up Unity behind my test project and had some troubles with singletons. There is some misleading information in documentation you should be aware of.
Read moreDuring one SharePoint migration project I had problem with document versions comments. I needed some way to set these in my code. As I didn’t found any normal way to do it through SharePoint API I worked out something I call dirty hack. But it works.
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This is rewrite of my old post about bullet-proof foreach loops. The post covers internals and functioning of foreach. It also shows how to write safe loops and how to modify collections that foreach is stepping through. This post is excellent reading for those who want to have better understanding of foreach loops.
Read moreWhen dealing with version numbers we often need to convert them to string and vice versa. There is lot of code where versions are handled manually in code. I don’t know why. But I know for sure there is class called Version and I’m sure this class will help us a lot. Let’s see a little example.
Read moreMigrating data from SP2001 to MOSS2007 is fun – if you know what I mean. During migration we discovered that migration tool has some serious bugs. I wrote some code that fixes some problems after importing process. There I found a problem – I needed to update list items without getting new versions of them after updates.
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Windows Installer is one of my favorite problem childs – of course, when it has mysteriuos problems. I found a problem when installing Outlook add-in on machine that has no extensibility features installed on it. Something was missing and installer gave me the famous “Unable to get installer types” error. After pointless waste of time tracing installer and checking its logs I checked out what’s going on in file system.
Read moreOne cool operators that C# offers us is ?? But before ?? we should know what does ? after variable type name. So, let’s take both of these question marks and let’s see what they are. Also let’s jump for a while behind compilator to see IL code that compiler produces.
Read moreI wanted to show our company’s blog feed on our intranet first page. There some empty space I wanted to fill somehow. I found a good solution, so there was no need for some third-party Web Parts. Also there was no need to write any additional code.
Read moreExtensions method introduced with C# 3.0 make it possible to “extend” existing classes with new methods without access to source code of those classes. This blog post is deeper technical introduction to extension methods for those who are making decisions about software design and architecture.
Read moreAutomatic properties are supported by C# since version 3.0 and as developers we use them almost every day. Sometimes developers have questions about how automatic properties work and how to effectively use them. Also I bust some myths about automatic properties and go deep with internals.
Read moreIn this example we will use simple color recalculation method to grayscale images. For each pixel on image we will calculate “average color” that we write back on image. Average color is sum of current color’s red, green and blue channels integer value divided by three. This value is assigned to all three channels for current pixel.
Read moreAt the end of the previous month I wrote a posting on DefensiveDatasource class that can be used to associate ASP.NET’s GridView with collections containing objects of different types and based on one and the same base class. Dividing data into pages in GridView does, however, not succeed. An error message “The data source does not support server-side data paging” is displayed.
Read moreI had a problem when trying to filter WSS 3.0 calendar list by Start Time column. This column doesn’t appear in filtered columns list somewhy. I found solution that smells like dirty hack to me, but at least it solved my problem.
Read moreWe recently implemented some changes in the software development methodology used at our company and quite by chance encountered an interesting .Net 2.0 problem. Namely, when an object array inherited from the same base class is cast on a base class and submitted to the data binder, the latter gets confused. The array contained objects from different classes but all these classes had one and the same base class.
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