How do I dynamiclly define this button?

How do I define this in C# code so it is created at runt开发者_StackOverflow中文版ime?

<Button Canvas.Left="100" Canvas.Top="380" Content="Answer" Height="23" Name="submit_btn" Width="75" Click="submit_btn_Click" />

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var b = new Button { Text = "Hello World", Left = 100, Top = 100, Width = 50, Height = 25 };
Controls.Add(b);

Place in constructor after InitializeComponent().