Question

I am creating Dynamic Rectangle and adding into StackPanel. I need to add text to each rectangle. How can I do that?

Answer 1

A Rectangle doesn’t have any child content, so you will need to put both controls inside of another panel, such as a grid:

<Grid>
    <Rectangle Stroke="Red" Fill="Blue"/>
    <TextBlock>some text</TextBlock>
</Grid>

You can also use a Border control, which will take a single child and draw a rectangle around it:

<Border BorderBrush="Red" BorderThickness="1" Background="Blue">
    <TextBlock>some text</TextBlock>
</Border>

You say “dynamic rectangle”, so it sounds like you are doing this in code. The equivalent C# would look something like this:

var grid = new Grid();
grid.Children.Add(new Rectangle() { Stroke = Brushes.Red, Fill = Brushes.Blue });
grid.Children.Add(new TextBlock() { Text = "some text" });
panel.Children.Add(grid);
// or
panel.Children.Add(new Border()
{
    BorderBrush = Brushes.Red,
    BorderThickness = new Thickness(1),
    Background = Brushes.Blue,
    Child = new TextBlock() { Text = "some text" },
});

But if you want a dynamic list of rectangles, you should probably use an ItemsControl:

<ItemsControl ItemsSource="{Binding}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Border BorderBrush="Red" BorderThickness="1" Background="Blue">
                <TextBlock Text="{Binding Text}"/>
            </Border>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

If you set the DataContext to a list of objects, this XAML will create a Border with a TextBlock for each one with the text set to the Text property on the object.