Step 1: Drag a Button,TextBox and TextBlock from Toolbox on your grid in MainPage.xaml.
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Step 2: Double click on Button in MainPage.xaml,this will open MainPage.xaml.cs.
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Step 3: Type this given code in MainPage.xaml.cs.
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Step 4: Save All files(control+shift+S) And Run in Local Machine.
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Step 5: Now Type any text in textBox and press Button.
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Step 6: This will give you result in TextBlock.
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That's it.