Events when using WPF and C# in Windows applications

Dear all,

I've created a textbox and created an event in the XAML file, just like this:
<TextBox Margin="48,110,105,177" x:Name="textBox" Text="TextBox" TextWrapping="Wrap" KeyDown="KeyDown" TextChanged="textBox_TextChanged">

However,
I'm not able to create a "Textbox_TextChanged" event in the C# actual code file.

How can this be done?
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