Information Technology Distilled

WPF DataBinding Overview

2009-02-04T15:05:00.001+02:00

I quick review of how WPF binding works can be found here. Basically the MSDN documents but very informative.

Deserialization Problems

2008-10-08T11:14:00.000+02:00

I had a problem: The constructor to deserialize an object of type was not found. Seems the solution might be simple enough.

Stored proc are bad, m'kay

2008-08-19T13:10:00.001+02:00

I hate stored procedures and personally do not use them, but this article really gives valid points to my preference of not using them at all.

Sending key presses to controls in WPF

2008-07-07T15:29:00.001+02:00

The easiest way is to do the following:

KeyEventArgs keyEventArgs = new KeyEventArgs(e.KeyboardDevice, e.InputSource, e.Timestamp, Key.Right);
keyEventArgs.RoutedEvent = e.RoutedEvent;
.RaiseEvent(keyEventArgs);

Because of security restrictions, the type {custom type} cannot be accessed

2008-06-13T11:42:00.002+02:00

Had the unfortunate priviledge of encountering this message when using remoting. The solution was quite simple at least.

Just add:
[assembly: AllowPartiallyTrustedCallers]

This solved the whole problem. The whole problem was in my case that my assembly was signed and it lived in the GAC. It is a framework assembly so it must be signed and must live in the GAC.

Performance Counters

2008-03-31T11:31:00.000+02:00

A quick and dirty way to add performance counters to your application.

Namespace problem in XAML

2008-03-21T08:36:00.001+02:00

I had to do some changes to my XAML forms, and decided to use XmlDocument or DOM for it. The DOM works great when only updating existing elements but when adding new elements it insists on adding the xmlns="..." attribute to all my new elements.

Unfortunately according to this conversation it is the way it is, so I was forced to massage the xml using standard string parsing just after XmlDocument serialized my XAML form.

Get the StackTrace in C#

2008-02-28T07:27:00.000+02:00

To get hold of the StackTrace is quite simple.

SSL TCP with C#

2008-02-16T11:36:00.001+02:00

A very nice example how to open a TCP connection using SSL.

Multiple step operation failure

2008-02-15T16:07:00.003+02:00

I have been struggling with this ADO error for a while now. It seems the solution is simple, the new value is longer than the actual field size. Refer to this post.

Data binding exceptions

2008-02-05T10:55:00.000+02:00

I recently had issues when binding to properties and those properties would throw exceptions. The following post help me figure out how to translate information back to the user.

WiX toolset

2007-12-08T08:39:00.000+02:00

I need more control over my whole build process and Installshield's little querks and ludicrous cost has forced me to look into the WiX toolset.

Wix wiki
Windows Installer XML (WiX) toolset has released as Open Source on SourceForge.net
WiX tutorial
Introducing WiX by Mike Gunderloy
Windows Installer XML (WiX) toolset on SourceForge.net
Using WiX to create Windows Installer Packages
Automate Releases With MSBuild And Windows Installer XML
Using the WiX Toolset to Integrate Setup into Your Development Process

Uninstall applications via C#

2007-12-07T17:36:00.000+02:00

I recently had to uninstall applications programmatically and it was quite simple. All the information needed resides in the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall registry key.

Dependency properties in a MTA thread, Part 2

2007-11-21T17:05:00.001+02:00

It seems it is easier accessing dependency properties on the STA (UI) from some MTA thread than it is to access dependency properties on the MTA thread from the STA (UI).

So I decided to go for the 'clipboard' approach, before calling the STA thread first copy the DP's to the clipboard and then paste from the clipboard in the STA, and vice versa.

Seems to work fine sofar.

Dependency properties in a MTA thread

2007-11-21T17:05:00.000+02:00

I have to bind to dp's from my UI (STA thread) that lives on a MTA thread. This post might have the solution.

Vista Remote Desktop to XP

2007-11-16T22:33:00.000+02:00

I need to use Remote Desktop to connect to my office but Vista keeps on nagging me about security. This article shows how to disable it.

Context Sensitive Help in WPF

2007-11-14T10:46:00.001+02:00

The new WPF paradigm does not have a context sensitive help option, but this article shows a quick and easy way to add it.

Xceed Grid and ComboBoxes

2007-11-13T14:28:00.000+02:00

I am currently struggling to make my Xceed grid use my custom combo boxes but the forums has a few posts related to the grid and combo boxes.

Display current cell in text box
Data grid and combobox
Custom editor cell activation
Handle double click on a row

Adding custom DataTemplates to custom user controls

2007-11-01T16:26:00.000+02:00

I struggled for a while to figure out how I can add DataTemplates to my custom WPF user controls but this article helped in that regard.

Smart Client Technology

2007-11-01T08:36:00.000+02:00

Some useful articles relating to Microsoft Smart Clients, I have not read it myself yet, but a friend of mine recommends these articles

MSDN article
The white paper
Article on the SCS Factory
WPF and the SCS Factory
WPF composite clients

The SCS factory is part of the open source initiative from Microsoft and is available at CodePlex.

Another article on version 1.0 of the factory is available here.

A quick start to CAB or composite clients is available here.

Custom size for WF activities

2007-09-18T10:02:00.000+02:00

I need to customize my activity's size in the WF designer. It seems this article has the answer. Will test it out later.

Calling WPF windows from WWF workflow

2007-08-15T15:08:00.000+02:00

I struggled for a long while to get my WPF forms to work from a workflow activity. This article was very helpful in accomplishing it.

Composite Activities

2007-08-08T12:22:00.000+02:00

I created a new composite activity that allows the execution of WPF windows from the workflow. Articles to fast track this development is available at

MSDN and
Commonality

Convert ExportedInstance to a class

2007-08-07T12:31:00.000+02:00

While busy traversing my domain model I needed some way of converting my ExportedInstance to the actual class I am interrested in.

This article helped in that, but basically all I needed was the following line of code:

EntityPlaceholder entityPlaceholder =
dis.ResolveExportedInstanceInDocument(dslNamespace, MELString, true) as
EntityPlaceholder;

Why cheap programmers are expensive

2007-08-07T12:17:00.000+02:00

I found this article and I can only hope that the industry wakes up very soon. Trying to develop software with cheap resources are really very expensive at the end of the day.

UML Composition and Aggregation

2007-07-27T10:52:00.000+02:00

To try and remember the difference between composition and aggregation the following articles are quite useful

Where should the business logic live?

2007-07-27T09:31:00.000+02:00

The following article says it all.

Property Collection Serialization, Part 3

2007-07-23T12:24:00.000+02:00

A full description and example of what I wanted to accomplish with my designer serialization is available here.

Property Collection Serialization, Part 2

2007-07-23T12:15:00.000+02:00

I managed to accomplish what I intended doing with the Designer Serialization. The following articles helped me along the way. I still only barely scratched the surface of CodeDOM but it was sufficient enough for what I wanted to accomplish.

The articles are:

CodeDomSerializer
Dynamic source code creation
How to create a class using CodeDOM and
Using CodeDOM

Property Collection Serialization

2007-07-19T16:24:00.000+02:00

I have problems serializing my collection properties. I want to specify exactly how the collection must be serialized and the following article might help in this regard.

Also to do custom designer serialization this article might help. Some more information is available in this article.

Currently is it like a lot of pieces of a puzzle I need to assemble. Very tedious and frustrating.

WWF Serialization

2007-07-19T14:50:00.000+02:00

I am experiencing a lot difficulty using WWF and its serialization mechanism. I am going to study the following articles, maybe it proofs to be helpful

Workflow custom designer, nothing to do with serialization but interesting still
GetWorkflowDefinition, explanation surrounding the workflow definition class
Serialization Part One
Serialization Part One and a Half
General WWF thoughts

I hope this will help in my serialization dilemma.

Workflow and ASP.NET

2007-07-19T13:13:00.001+02:00

A very in depth article about Workflow and ASP.NET is available here.

It is an article in the MSDN Magazine.

Matevz Gacnik also has some tips on publishing a workflow as a web service.

Workflow tracking

2007-07-19T13:02:00.000+02:00

To get workflow runtime properties Matt Milner suggest making use of a tracking service.

It sounds good but there is a performance overhead related to tracking.

XPath syntax

2007-07-18T15:57:00.000+02:00

For a quick reference to the XPath syntax just go over to w3schools.

To actually get some values from an XML using XPath the following code snippet might help:

Cider is still CTP

2007-07-18T11:45:00.000+02:00

I also just realized that Cider is a CTP release and there will be no more releases of Cider. The new version of Cider will be released with Orcas.

References
John Rayner
WCF, WPF VS 2005 RTM Extension

XAML Window inheritance

2007-07-18T11:34:00.000+02:00

The XAML window inheritance is proving to be a challenge. I changed my XAML to inherit from my base window, but now Cider refuses to open my Window. It gives the following error:

Microsoft's Expression Blend has no problem opening, compiling and running my XAML window.

WPF Window Inheritance

2007-07-18T10:25:00.000+02:00

I tried the inheritance suggested by this article but unfortunately my base window may not be XAML defined apparently.

This is a bit of disappointment but I guess I can work around this somehow.

WPF Windows inheritance

2007-07-17T17:31:00.000+02:00

I need a base WPF window with common functions inside of it and then all my WPF windows will derive from this window. It is a bit of a hassle to say the least. This article explains it in more detail.

WPF and XAML coding options

2007-07-17T14:55:00.000+02:00

There are three ways of coding WPF windows:

Code only
Code + Markup, runtime parsing and
Code + Markup, compiled binary

This article has more detail with some pros and cons.

Instantiate Generic Types via Reflection

2007-07-16T13:55:00.000+02:00

I recently had to instantiate an instance of a generic type at runtime via reflection. The following article was quite useful.

WPF performs slow with Office 2003 Updates

2007-07-13T15:20:00.000+02:00

According to Rob his WPF started performing poorly after he installed some Windows updates relating to Office 2003. Read more about this over here.

WPF does not support MDI

2007-07-13T11:29:00.000+02:00

According to Chris Anderson¹, WPF does not support MDI and if you want to use MDI he recommends using Windows Forms rather. Very interesting, I had a discussion with a colleague of mine back in 2004 and he insisted SDI is better than MDI. At that point I did not agree and I still prefer MDI over SDI in many cases but I am guessing it is time to go with the main stream then.

1. p52 Essential Windows Presentation Foundation, Chris Anderson

Custom WPF controls

2007-07-12T11:32:00.000+02:00

A small introductory article about custom WPF controls.

WPF Commands

2007-07-12T11:28:00.000+02:00

WPF controls has something called a Command which links to an ICommand interface. For a better in depth explanation this article is quite useful.

DepencyObject and DependencyProperty explanations

2007-07-11T13:58:00.000+02:00

I am still a bit new to the DependencyObject and DependencyProperty concept so for later reference these articles may proof useful

hack.brain's Avalon: Understanding ...
Adventures with WPF's Dependency Properties
K. Scott Allens' Dependency Property Notes
Josh Smith of WPF's Overview of ...
Marcel de Vries' WF Dependency ...
Josh Smith on WPF's Overview of ...
Josh Smith on WPF's Demystifying dependency properties
Josh Smith on WPF's Further demystifying ...

Install components in VS 2005

2007-07-09T17:07:00.000+02:00

The following article has a link to a helpful library to install components as part of the Installshield setup process.

Synchronous WWF

2007-07-09T13:59:00.000+02:00

To use synchronous WWF with ASP.NET this article seems to give a solution.

To use synchronous WWF with standard .NET this article seems to have the solution and it has some explanations surrounding dependency properties and WWF.

Some more detail WWF example over here.

An outdated article explaining a custom activity to allow synchronous workflow is available here.

10 usability heuristics

2007-07-07T09:00:00.000+02:00

This article has some informative points regarding usability heuristics. The 10 heuristics is platform independent and to the point. Very good guidelines when designing new applications.

Online Analytic Processing (OLAP)

2007-07-04T07:43:00.000+02:00

When considering OLAP two points may be of help to increase speed

OLAP does not require the latest version of the data, so OLAP services do not need to run on a live transactional database
Execute OLAP services on a centralized repository or datawarehouse

For more information refer to p848-p854 of Database Management Systems by Ramakrishnan.

Distributed Database Concepts

2007-07-03T18:29:00.000+02:00

A distributed database should have the following desired attributes¹

Distributed data independence, users should be able to ask queries without specifying the referenced relations
Distributed transaction atomicity, users should be able to update and access data across sites

When a slow connection is used between sites these attributes may not be achievable or desirable.

Data storage across multiple databases can use one or both of the following techniques²

Fragmentation
Replication

to increase speed and responsiveness.

Fragmentation may use

Horizontal or
Vertical fragmentation

Replication allows

Increased availability of data
Faster query evaluation

The current approach we are considering is fragmentation paired with replication. We will fragment the data to manage ownership of data to avoid the sync problems associated with multiple changes to the same record of data from multiple sites. Read only queries will be executed on the local replicated data because this will allow better data availability and faster query evaluation.

References:

p736 Database Management Systems, Ramakrishnan
p739-p741 Database Management Systems, Ramakrishnan

Introduction to Windows Workflow Foundation

2007-07-03T12:25:00.000+02:00

The following article has a nice introduction to the WWF.

Some interesting features of WWF includes

The BPEL library that allows the WWF workflow to be exported as BPEL to be used by any standard BPEL engine.
Custom Activities has themes.
Workflow can be dehydrated and rehydrate using SQL Express.

Hosting sections of a workflow on multiple machines is acceptable.

IT Distilled

2007-06-27T12:00:00.000+02:00

I decided to create a blog to keep track of all the little IT articles I stumble across. So this blog is just an easy way of cataloging my article finds or just excerpts of articles.