MainView.xaml

<UserControl x:Class="Example.View.MainView"
    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:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
    xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
    xmlns:ViewModel="clr-namespace:Example.ViewModel"
    mc:Ignorable="d" d:DesignHeight="400" d:DesignWidth="400"
    DataContext="{dxmvvm:ViewModelSource Type=ViewModel:MainViewModel}">
    <UserControl.Resources>
        <dxmvvm:BooleanNegationConverter x:Key="BooleanNegationConverter"/>
    </UserControl.Resources>

    <Grid>
        <StackPanel Orientation="Vertical" Margin="10" dxe:ValidationService.IsValidationContainer="True" x:Name="validationContainer">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <StackPanel Orientation="Vertical" Margin="0,0,4,6">
                    <TextBlock Text="Name" Margin="6,2,0,2"/>
                    <dxe:TextEdit NullText="First" EditValue="{Binding FirstName, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"/>
                </StackPanel>
                <StackPanel Orientation="Vertical" Margin="4,0,0,6" Grid.Column="1">
                    <TextBlock Text=" " Margin="6,2,0,2"/>
                    <dxe:TextEdit NullText="Last" EditValue="{Binding LastName, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"/>
                </StackPanel>
            </Grid>
            <StackPanel Orientation="Vertical" Margin="0,0,0,6">
                <TextBlock Text="Email" Margin="6,2,0,2"/>
                <dxe:TextEdit EditValue="{Binding Email, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"/>
            </StackPanel>
            <StackPanel Orientation="Vertical" Margin="0,0,0,6">
                <TextBlock Text="Password" Margin="6,2,0,2"/>
                <dxe:PasswordBoxEdit EditValue="{Binding Password, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"/>
            </StackPanel>
            <StackPanel Orientation="Vertical" Margin="0,0,0,6">
                <TextBlock Text="Confirm Password" Margin="6,2,0,2"/>
                <dxe:PasswordBoxEdit EditValue="{Binding ConfirmPassword, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"/>
            </StackPanel>

            <Button VerticalAlignment="Top" Content="Sign Up" Width="150" HorizontalAlignment="Right" Margin="0,10"
                IsEnabled="{Binding Path=(dxe:ValidationService.HasValidationError), ElementName=validationContainer, Converter={StaticResource BooleanNegationConverter}}"/>
        </StackPanel>
    </Grid>
</UserControl>