Empty value at the text box result in exception

[ajeebkp23]

I am a beginner in WPF. So I coded the entire blog article at my own will. Then I found it is leading to an exception when input box is empty. Here is my code, on which I fixed the error. https://github.com/ajeebkp23/Simplest-WPF-MVVM-Example. Since, I didn't forked your code I am not coming with a PR.

[MarkWithall]

Indeed it does. Well spotted. I'm surprised that no one else has noticed this before. Thanks for letting me know.

The question is now, is it better for:

• the TextConverter convertion [sic] parameter (which is spelled wrong in the example) to handle null in the model;
• or, SomeText in Presenter to not allow null in the viewmodel (by initialising it to an empty string)
• or, ConvertText to do nothing if SomeText is null (and possibly empty string too) - and maybe pop up a message box informing the user

This would be a much tidier fix in C# 6.0; I must create a branch with a C# 6.0 version of the code.