if statement with an element of my MainWindow.xaml

I have an element in my MainWindow.xaml with a name:

<Canvas x:Name="Calque1" Width="97" Height="30" Canvas.Left="0" Canvas.Top="0">

Is it possible to do a "if statement" with Calque1 in the MainWindow.xaml.cs?

Something a bit like that:

 if(theme == 0)
 {
     model.SetImageData(File.ReadAllBytes(@"D:\My_Files\Planche 4\Planche_2018-01-15 (v 4.0.0.4)\Planche\Resources\logo.png"));
 }
 else 
 {
     (Put somthing here to display Calque1);
 }

Can't find a usefull answer.