Your XAML is incorrect, but I guess you want to see this:
Style st = new Style();
DataTrigger tg = new DataTrigger()
{
Binding = new Binding("CustomerId"),
Value = 1
};
tg.Setters.Add(new Setter()
{
Property = Control.BackgroundProperty,
Value = ColorConverter.ConvertFromString("Red")
});
st.Triggers.Add(tg);
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