Blagodat/OknaFunciy/AddZakazWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Demka_Snova_1.Hardik.Conect.Dao"
        mc:Ignorable="d"
        x:Class="Demka_Snova_1.OknaFunciy.AddZakazWindow"
        Title="Оформление заказа"
        Width="800"
        Height="600">
	<Grid>
		<Grid.RowDefinitions>
			<RowDefinition Height="Auto"/>
			<RowDefinition Height="*"/>
			<RowDefinition Height="Auto"/>
		</Grid.RowDefinitions>

		<StackPanel Grid.Row="0" Margin="10" Spacing="5">
			<TextBlock Text="Оформление нового заказа" FontSize="16" FontWeight="Bold"/>

			<Grid>
				<Grid.ColumnDefinitions>
					<ColumnDefinition Width="Auto"/>
					<ColumnDefinition Width="*"/>
				</Grid.ColumnDefinitions>

				<TextBlock Text="Номер заказа:" VerticalAlignment="Center"/>
				<TextBox x:Name="OrderNumberTextBox" Grid.Column="1" Margin="5,0"
                         KeyDown="OrderNumberTextBox_KeyDown"/>
			</Grid>

			<Border Height="1" Background="LightGray" Margin="0,10"/>
		</StackPanel>

		<TabControl Grid.Row="1" Margin="10">
			<TabItem Header="Клиент">
				<Grid>
					<Grid.RowDefinitions>
						<RowDefinition Height="Auto"/>
						<RowDefinition Height="*"/>
					</Grid.RowDefinitions>

					<StackPanel Grid.Row="0" Spacing="5">
						<TextBox x:Name="ClientSearchTextBox" Watermark="Поиск клиента..."
                                 TextChanged="ClientSearchTextBox_TextChanged"/>
						<Button x:Name="AddClientButton" Content="Добавить нового клиента"
                                Click="AddClientButton_Click"/>
					</StackPanel>

					<DataGrid x:Name="ClientsDataGrid" Grid.Row="1"
                  SelectionMode="Single" AutoGenerateColumns="False"
                  IsReadOnly="True" SelectionChanged="ClientsDataGrid_SelectionChanged"
                  x:DataType="local:KlientDao">
						<DataGrid.Columns>
							<DataGridTextColumn Header="Код" Binding="{Binding Code}" Width="Auto"/>
							<DataGridTextColumn Header="ФИО" Binding="{Binding Fio}" Width="*"/>
						</DataGrid.Columns>
					</DataGrid>

					<DataGrid x:Name="ServicesDataGrid" Grid.Row="1"
							  SelectionMode="Single" AutoGenerateColumns="False"
							  IsReadOnly="True"
							  x:DataType="local:uslugiDao">
						<DataGrid.Columns>
							<DataGridTextColumn Header="Код" Binding="{Binding Code}" Width="Auto"/>
							<DataGridTextColumn Header="Наименование" Binding="{Binding Name}" Width="*"/>
							<DataGridTextColumn Header="Цена/час" Binding="{Binding PrisePerH}" Width="*"/>
						</DataGrid.Columns>
					</DataGrid>

					<DataGrid x:Name="SelectedServicesDataGrid" Grid.Row="0"
                  AutoGenerateColumns="False" IsReadOnly="True"
                  x:DataType="local:SelectedService">
						<DataGrid.Columns>
							<DataGridTextColumn Header="Услуга" Binding="{Binding Name}" Width="*"/>
							<DataGridTextColumn Header="Цена/час" Binding="{Binding PrisePerH}" Width="Auto"/>
							<DataGridTextColumn Header="Часы" Binding="{Binding Hours}" Width="Auto"/>
							<DataGridTextColumn Header="Сумма" Binding="{Binding Total}" Width="Auto"/>
						</DataGrid.Columns>
					</DataGrid>

					<StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right" Spacing="5">
						<Button x:Name="RemoveServiceButton" Content="Удалить"
                                Click="RemoveServiceButton_Click"/>
						<TextBlock x:Name="TotalPriceTextBlock" FontWeight="Bold" FontSize="14"
                                   VerticalAlignment="Center" Margin="10,0"/>
					</StackPanel>
				</Grid>
			</TabItem>
		</TabControl>


		<Button x:Name="SaveOrderButton" Content="Сохранить заказ"
				Click="SaveOrderButton_Click" IsEnabled="False"/>
		<Button x:Name="CancelButton" Content="Отмена" Click="CancelButton_Click"/>
	</Grid>
</Window>