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Setting design time DataContext on a Window is giving a compiler error?

I have the following XAML below for the main window in my WPF application, I am trying to set the design time d:DataContext below, which I can successfully do for all my various UserControls, but it gives me this error when I try to do it on the window... ...
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Time complexity of Sieve of Eratosthenes algorithm

...cals of primes up to n, which is O(n log log n). (See here or here.) The "find the next prime number" bit is only O(n) overall, amortized — you will move ahead to find the next number only n times in total, not per step. So this whole part of the algorithm takes only O(n). So using these two yo...
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How do I change bash history completion to complete what's already on the line?

...nths ago that made my bash history auto-complete on what's already on the line when pressing the up arrow: 5 Answers ...
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Check if a value is within a range of numbers

I want to check if a value is in an accepted range. If yes, to do something; otherwise, something else. 7 Answers ...
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How do you create nested dict in Python?

I have 2 CSV files: 'Data' and 'Mapping': 4 Answers 4 ...
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extract part of a string using bash/cut/split

I have a string like this: 5 Answers 5 ...
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Python: Select subset from list based on index set

I have several lists having all the same number of entries (each specifying an object property): 5 Answers ...
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Extract elements of list at odd positions

So I want to create a list which is a sublist of some existing list. 5 Answers 5 ...
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PHP Timestamp into DateTime

...how I can convert this to a strtotime, or a similar type of value to pass into the DateTime object? 4 Answers ...
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What is the relationship between UIView's setNeedsLayout, layoutIfNeeded and layoutSubviews?

Can anyone give a definitive explanation on the relationship between UIView's setNeedsLayout , layoutIfNeeded and layoutSubviews methods? And an example implementation where all three would be used. Thanks. ...