A comparison between classic C#, C# markup, and XAML for creating UI

basic-example-clasic-cs.cs

var grid = new Grid();

var label = new Label { Text = "Code:" };
grid.Children.Add(label, 0, 1);

var entry = new Entry 
{ 
   Placeholder = "Enter number", 
   Keyboard = Keyboard.Numeric, 
   BackgroundColor = Color.AliceBlue, 
   TextColor = Color.Black, 
   FontSize = 15,
   HeightRequest = 44, 
   Margin = 20 
};

grid.Children.Add(entry, 0, 2);
Grid.SetColumnSpan(entry, 2);

entry.SetBinding(Entry.TextProperty, new Binding("RegistrationCode"));

Content = grid;

basic-example-cs-markup-no-spacing.cs

Content =  new Grid { 
   Children = {
       new Label { Text = "Code:" }.Row(1),

       new Entry { 
           Placeholder = "Enter number", 
           Keyboard = Keyboard.Numeric, 
           BackgroundColor = Color.AliceBlue, 
           TextColor = Color.Black 
       } 
       .Font(15)
       .Row(2)
       .ColumnSpan(2) 
       .Margin(20)
       .Height(44)
       .Bind("RegistrationCode")
   }};

basic-example-cs-markup-original.cs

Content =  new Grid 
{ 
   Children = {
       new Label { Text = "Code:" }
           .Row(1),

       new Entry { 
           Placeholder = "Enter number", 
           Keyboard = Keyboard.Numeric, 
           BackgroundColor = Color.AliceBlue, 
           TextColor = Color.Black 
       } 
       .Font(15)
       .Row(2)
       .ColumnSpan(2) 
       .Margin(20)
       .Height(44)
       .Bind("RegistrationCode")
   }
};

basic-example-cs-markup-personal-recipe.cs

Content =  new Grid { 
   Children = {
       new Label { Text = "Code:" }.Row(1),

       new Entry { 
           Placeholder = "Enter number", 
           Keyboard = Keyboard.Numeric, 
           BackgroundColor = Color.AliceBlue, 
           TextColor = Color.Black,
           FontSize = 15,
           HeightRequest = 44,
           Margin = 20
       } 
       .Row(2)
       .ColumnSpan(2) 
       .Bind("RegistrationCode")
   }};

basic-example-xaml.xaml

<ContentPage.Content>
        <Grid>
            <Label Grid.Row="1" Text="Code:" />

            <Entry
                Grid.Row="1"
                Grid.ColumnSpan="2"
                Margin="20"
                BackgroundColor="AliceBlue"
                FontSize="15"
                HeightRequest="44"
                Keyboard="Numeric"
                Placeholder="Enter number"
                Text="{Binding RegistrationCode}"
                TextColor="Black" />
        </Grid>
</ContentPage.Content>