MainWindow.xaml.cs

using System.Windows;
using ChessApp.ViewModels;

namespace ChessApp
{
    public partial class MainWindow : Window
    {
        private ChessViewModel viewModel = new ChessViewModel();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void CreateButton_Click(object sender, RoutedEventArgs e)
        {
            viewModel.SelectedPiece = (PieceComboBox.SelectedItem as System.Windows.Controls.ComboBoxItem)?.Content.ToString();
            viewModel.SelectedPieceColor = (PieceColorComboBox.SelectedItem as System.Windows.Controls.ComboBoxItem)?.Content.ToString();
            viewModel.StartPosition = StartBox.Text.ToUpper();
            viewModel.CreatePiece();

            ResultText.Text = viewModel.ResultMessage;
        }

        private void MoveButton_Click(object sender, RoutedEventArgs e)
        {
            viewModel.TargetPosition = TargetBox.Text.ToUpper();
            viewModel.TryMove();
            ResultText.Text = viewModel.ResultMessage;
        }
    }
}