temporary

Stars Assistant/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:net.nehmer.sa.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="net.nehmer.sa.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Title="GetStartedApp">
+
+        <!-- Icon="/Assets/avalonia-logo.ico" -->
+
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <StackPanel>
+        <Border Margin="5" CornerRadius="10" Background="LightBlue">
+            <TextBlock Margin="5" FontSize="24" HorizontalAlignment="Center" Text="{Binding Greeting}"></TextBlock>
+        </Border>
+        <Grid ShowGridLines="True" Margin="5" ColumnDefinitions="120, 100" RowDefinitions="Auto, Auto, Auto">  
+            <Label Grid.Row="0" Grid.Column="0" Margin="10">Celsius</Label>
+            <TextBox Grid.Row="0" Grid.Column="1" Margin="0 5" Text="0" Name="celsius"/>
+            <Label Grid.Row="1" Grid.Column="0" Margin="10">Fahrenheit</Label>
+            <TextBox Grid.Row="1"  Grid.Column="1" Margin="0 5" Text="0" Name="fahrenheit"/>
+            <Button Grid.Row="2" Grid.Column="1" Margin="0 5" Click="ButtonClicked">Calculate</Button>
+        </Grid>
+  </StackPanel>
+
+</Window>

Stars Assistant/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using System.Diagnostics;
+using System;
+
+namespace net.nehmer.sa.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+    public void ButtonClicked(object source, RoutedEventArgs args)
+    {
+        if (Double.TryParse(celsius.Text, out double C))
+        {
+            var F = C * (9d / 5d) + 32;
+            fahrenheit.Text = F.ToString("0.0");
+        }
+        else
+        {
+            celsius.Text = "0";
+            fahrenheit.Text = "0";
+        }
+    }
+}