Blank screen on Xamarin - xaml

Question

I have a Xamarin portable project.
The Xaml pages I debug are totally blank and I cannot see any components on the pages on both Android and IOS.
How can I fix this?
Note: It gets no error messages, the pages are opening and I cannot see anything on them.
The problem occured after this error. When I fixed it the pages I debug become opening empty,
although they were working before InitializeComponent error.
Any help would be greatly appreciated.
This is my xaml :
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="AcikAkademi3.Layoutlar.GridOrnek3">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Label BackgroundColor="Red" Text="0,0" Grid.Column="0" Grid.Row="0">
</Label>
<Label BackgroundColor="Blue" Text="1,0" Grid.Column="1" Grid.Row="0">
</Label>
<Label BackgroundColor="Yellow" Text="Açık Akademi" Grid.Column="2" Grid.Row="0"></Label>
<Label BackgroundColor="White" Text="0,1" Grid.Column="0" Grid.Row="1">
</Label>
<Label BackgroundColor="Silver" Text="1,1" Grid.Column="1" Grid.Row="1">
</Label>
<Label BackgroundColor="Lime" Text="2,1" Grid.Column="2" Grid.Row="1">
</Label>
</Grid>
</ContentPage>
This is my cs :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace AcikAkademi3.Layoutlar
{
public partial class GridOrnek3 : ContentPage
{
public GridOrnek3()
{
Padding = new Thickness(0, 20, 0, 0);
}
}
}
App.cs :
using AcikAkademi3.Layoutlar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xamarin.Forms;
namespace AcikAkademi3
{
public class App : Application
{
public App()
{
MainPage = new GridOrnek3();
}
protected override void OnStart()
{
}
protected override void OnSleep()
{
}
protected override void OnResume()
{
}
}
}

Answer 1

You should call InitializeComponent() in ctor.
Otherwise UI elements will not init from xaml file.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace AcikAkademi3.Layoutlar
{
public partial class GridOrnek3 : ContentPage
{
public GridOrnek3()
{
InitializeComponent();
Padding = new Thickness(0, 20, 0, 0);
}
}
}
Okay,
Looks like there is a mistake in xaml file
<Label BackgroundColor="Brown" Text="0,1" Grid.Column="0" Grid.Row="1">
</Label>
There is no Brown color, try to chose something from this table
This works for me
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Label Grid.Column="0"
Grid.Row="0"
BackgroundColor="Red"
Text="0,0" />
<Label Grid.Column="1"
Grid.Row="0"
BackgroundColor="Blue"
Text="1,0" />
<Label Grid.Column="2"
Grid.Row="0"
BackgroundColor="Yellow"
Text="Açık Akademi"/>
<Label Grid.Column="0"
Grid.Row="1"
BackgroundColor="Olive"
Text="0,1" />
<Label Grid.Column="1"
Grid.Row="1"
BackgroundColor="Silver"
Text="1,1" />
<Label Grid.Column="2"
Grid.Row="1"
BackgroundColor="Lime"
Text="2,1" />
</Grid>

Answer 2

In fact, it seems that upon the InitializeComponent line is needed.