Otel/HotelCalifornia/ClientRoom.xaml

<Window x:Class="HotelCalifornia.ClientRoom"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        xmlns:local="clr-namespace:HotelCalifornia"
        mc:Ignorable="d"
        Title="ClientRoom" Height="450" Width="800" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" WindowStyle="None" Icon="image/h1.png" Loaded="Window_Loaded">
    <Grid MouseDown="Grid_MouseDown">
        <Grid.Background>
            <LinearGradientBrush StartPoint="0.1,0" EndPoint="0.9,1">
                <GradientStop Color="#7E42F5" Offset="1" />
                <GradientStop Color="#383E7A" Offset="0"/>
            </LinearGradientBrush>
        </Grid.Background>
        <Label Content="Заселение клиентов" Foreground="White" FontSize="35" FontFamily="Century Gothic" HorizontalAlignment="Center" Margin="215,46,215,344.6"/>
        <Button
  Style="{StaticResource MaterialDesignIconButton}"
  ToolTip="Выход из приложения" Margin="742,10,10,391.6" Click="Close">
            <materialDesign:PackIcon
    Kind="ExitToApp" Foreground="White"/>
        </Button>
        <Button
  Style="{StaticResource MaterialDesignIconButton}"
  ToolTip="Вернуться к окну выбора функции" Margin="10,10,742,391.6" Click="Back">
            <materialDesign:PackIcon
    Kind="Backburger"  Foreground="White"/>
        </Button>
        <TextBlock Name="timetxt" HorizontalAlignment="Center" FontFamily="Century Gothic" Margin="561,115,10,0" TextWrapping="Wrap" Foreground="White" FontSize="22" VerticalAlignment="Top" Height="28" Width="229"/>
        <Button Name="WindMin"
  Style="{StaticResource MaterialDesignIconButton}"
  ToolTip="Свернуть окно" Margin="694,10,58,391.6" Click="WindMin_Click">
            <materialDesign:PackIcon
    Kind="WindowMinimize" Foreground="White"/>
        </Button>
        <DataGrid Name="dataclientroom" IsReadOnly="True" HorizontalAlignment="Left" Height="257" Margin="293,158,0,0" BorderThickness="1" BorderBrush="Black" VerticalAlignment="Top" Width="497" SelectionChanged="dataClientRoom_SelectionChanged"/>
        <ComboBox Name="roomcombo" Margin="10,158,534,243.6" FontSize="18" FontFamily="Century Gothic" Foreground="White" Style="{StaticResource MaterialDesignFloatingHintComboBox}"
             materialDesign:ColorZoneAssist.Mode="Inverted" materialDesign:HintAssist.Hint="Комната" Height="48"/>
        <ComboBox Name="clientcombo" Margin="10,224,534,177.6" FontSize="18" FontFamily="Century Gothic" Foreground="White" Style="{StaticResource MaterialDesignFloatingHintComboBox}"
             materialDesign:ColorZoneAssist.Mode="Inverted" materialDesign:HintAssist.Hint="Клиент" Height="48"/>
        <StackPanel Margin="62,312,589,51.6" Orientation="Horizontal">
            <Button Style="{StaticResource MaterialDesignIconButton}" Foreground="White" ToolTip="Добавить" Margin="25,0,0,0" Click="Add_Click">
                <materialDesign:PackIcon Kind="Add" />
            </Button>
            <Button Style="{StaticResource MaterialDesignIconButton}" Foreground="White" ToolTip="Удалить" Margin="25,0,0,0" Click="Delete_Click">
                <materialDesign:PackIcon Kind="Delete" />
            </Button>
        </StackPanel>
        <Button Style="{StaticResource MaterialDesignIconButton}" Foreground="White" ToolTip="Обновить" Margin="508,103,244,298.6" Click="Refresh_Click">
            <materialDesign:PackIcon Kind="Refresh" />
        </Button>
    </Grid>
</Window>