I built a Cryptography application by using TripleDES. But I got an error:
System.Security.Cryptography.CryptographicException: Specified key is not a valid size for this algorithm.
The key I used was in an incorrect length, it should 16 bytes length.
For example:

Code

I am running out of licenses for Visual Studio Professional. Solution 1 is asking for more budget this year in IT. Another option is using Express version. I know this version doesn't come with automated testing and class diagrams, those sorts of developers' support tools.However, we don't use those tools a lot. We just build MVC website. So far, Visual Studio 2013 Express is ok for us, it supports NuGet, MVC and EF. I felt that is even faster then the Professional version.

I tried the icon attribute in MenuItem. It doesn't work.Actually, you need to modify the header element like this:

XML

Actually, for WPF TextBlock Component, there is no click event. The best replacement is Mouse Down Event,
Like this:

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The best way to design an interface for WPF is using xaml. However, in some situation, we need to change the layout in code. For example, we select a category view, we need to add a new block in a stack panel.
For example:

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