Otel/HotelCalifornia/Client.xaml

<Window x:Class="HotelCalifornia.Client"
        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="Client" Height="450" Width="800" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" WindowStyle="None" Icon="image/h1.png">
    <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="Информация о клиентах" Foreground="White" FontSize="35" FontFamily="Century Gothic" HorizontalAlignment="Center" Margin="148,54,148,336.6"/>
        <StackPanel Margin="6,124,547,68.6" Orientation="Vertical">
            <TextBox Name="nametxt" Margin="10,0,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="White" MaxLength="15"
  materialDesign:HintAssist.Hint="Имя клиента"/>
            <TextBox Name="familiatxt" Margin="10,15,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="White" MaxLength="15"
  materialDesign:HintAssist.Hint="Фамилия клиента"/>
            <TextBox Name="otchestvotxt" Margin="10,15,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="White" MaxLength="25"
  materialDesign:HintAssist.Hint="Отчество клиента"/>
            <ComboBox Margin="10,10,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="White"
                      Style="{StaticResource MaterialDesignFloatingHintComboBox}"
                       materialDesign:ColorZoneAssist.Mode="Inverted"
  materialDesign:HintAssist.Hint="Страна">
                <ComboBoxItem
    Content="Россия" />
                <ComboBoxItem
    Content="США" />
                <ComboBoxItem
    Content="Украина" />
                <ComboBoxItem
    Content="Швеция" />
                <ComboBoxItem
    Content="Казахстан" />
                <ComboBoxItem
    Content="Белоруссия" />
            </ComboBox>
        </StackPanel>
        <StackPanel Margin="0,320,547,43.6" Orientation="Horizontal">
            <Button
  Style="{StaticResource MaterialDesignIconButton}" Foreground="White"
  ToolTip="Добавить" Margin="25,0,0,0">
                <materialDesign:PackIcon
    Kind="Add" />
            </Button>
            <Button
  Style="{StaticResource MaterialDesignIconButton}" Foreground="White"
  ToolTip="Редактировать" Margin="25,0,0,0">
                <materialDesign:PackIcon
    Kind="Edit" />
            </Button>
            <Button
  Style="{StaticResource MaterialDesignIconButton}" Foreground="White"
  ToolTip="Удалить" Margin="25,0,0,0">
                <materialDesign:PackIcon
    Kind="Delete" />
            </Button>
        </StackPanel>
        <DataGrid HorizontalAlignment="Left" Height="257" Margin="293,124,0,0" VerticalAlignment="Top" Width="497" />
        <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>
        <Button
  Style="{StaticResource MaterialDesignIconButton}"
  ToolTip="Выход из приложения" Margin="742,10,10,391.6" Click="Close">
        <materialDesign:PackIcon
    Kind="ExitToApp" Foreground="White"/>
        </Button>
    </Grid>
</Window>