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