How to Add an image in a WPF button ?

Use this content templete:

<Button Grid.Row="2" Grid.Column="0" Width="20" Height="20"
    Template="{StaticResource SomeTemplate}">
  <Button.ContentTemplate>
    <DataTemplate>
      <Image Source="../Folder1/Img1.png" Width="20" />
    </DataTemplate>
  </Button.ContentTemplate>
</Button>

  Try this code for the solution:

<Button Height="100" Width="100">
  <StackPanel>
    <Image Source="img.jpg" />
    <TextBlock Text="Blabla" />
  </StackPanel>
</Button>

Use this xaml code:

<Button Width="300" Height="50">
  <StackPanel Orientation="Horizontal">
    <Image Source="Pictures/img.jpg" Width="20" Height="20"/>
    <TextBlock Text="Blablabla" VerticalAlignment="Center" />
  </StackPanel>
</Button>

If XAML components are in a tree structure, Add the control to its parent control. The beneath code piece additionally works fine. Give a name for your XAML root framework as ‘MainGrid‘.

Image img = new Image();
img.Source = new BitmapImage(new Uri(@"foo.png"));
StackPanel stackPnl = new StackPanel();
stackPnl.Orientation = Orientation.Horizontal;
stackPnl.Margin = new Thickness(10);
stackPnl.Children.Add(img);
Button btn = new Button();
btn.Content = stackPnl;
MainGrid.Children.Add(btn);