The margin property in WPF allows you set spacing between elements in a window. You can assign the margins for the Top, Right, Bottom and Left.
Every control that derives from FrameworkElement has this property.
A simple mark up XAML code with margins is:
It'll render something like this:
Margin in code
The margin property is of type Thickness so you should be able to set margins in code using the following snippet:
buttonTest.Margin = new Thickness(0, 120, 9, 213);