Be aware that boxing and unboxing values so that you can use the Base Class Libraries carries a performance cost.
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It's essential to know the differences in these libraries and use them correctly. This brief tutorial will guide you.
Value Converters can give you a new vista of usage in XAML. Learn to use them here.
Follow these tips to remember all the finer details that can quickly be forgotten in the zoo of developing a decent application.
Application Programming Interfaces (APIs) are where you have to be. It's not a matter of if as much as a matter of which.