using Azure.AI.OpenAI;
using DevExpress.AIIntegration;
using Microsoft.Extensions.AI;
using System.ClientModel;
// ...
public partial class App : Application {
    static string AzureOpenAIEndpoint { get { return "AZURE_OPENAI_ENDPOINT"; } }
    static string AzureOpenAIKey { get { return "AZURE_OPENAI_APIKEY"; } }
    static string DeploymentName { get { return "gpt-4o-mini"; } }

    public App() {
        IChatClient chatClient = new AzureOpenAIClient(
           new Uri(AzureOpenAIEndpoint),
           new ApiKeyCredential(AzureOpenAIKey))
               .GetChatClient(DeploymentName).AsIChatClient();
        AIExtensionsContainerDesktop.Default.RegisterChatClient(chatClient);
    }
}

Imports Azure.AI.OpenAI
Imports DevExpress.AIIntegration
Imports Microsoft.Extensions.AI
Imports System.ClientModel
' ...
Partial Public Class App
    Inherits Application
    Private Shared ReadOnly Property AzureOpenAIEndpoint() As String
        Get
            Return "AZURE_OPENAI_ENDPOINT"
        End Get
    End Property
    Private Shared ReadOnly Property AzureOpenAIKey() As String
        Get
            Return "AZURE_OPENAI_APIKEY"
        End Get
    End Property
    Private Shared ReadOnly Property DeploymentName() As String
        Get
            Return "gpt-4o-mini"
        End Get
    End Property
    Public Sub New()
        Dim chatClient As IChatClient = (New AzureOpenAIClient(New Uri(AzureOpenAIEndpoint), New ApiKeyCredential(AzureOpenAIKey))).GetChatClient(DeploymentName).AsIChatClient()
        AIExtensionsContainerDesktop.Default.RegisterChatClient(chatClient)
    End Sub
End Class

xmlns:dxp="http://schemas.devexpress.com/winfx/2008/xaml/printing" 
xmlns:dxai="http://schemas.devexpress.com/winfx/2008/xaml/ai" 
xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"  
... 
<dxp:DocumentPreviewControl Name="preview"> 
    <dxmvvm:Interaction.Behaviors> 
        <dxai:DocumentTranslateInlineBehavior>
            <dxai:LanguageInfo Culture="de-DE"/> 
        </dxai:DocumentTranslateInlineBehavior>
    </dxmvvm:Interaction.Behaviors> 
</dxp:DocumentPreviewControl>

using System.Collections.Generic;
using System.Globalization;
using DevExpress.AIIntegration;
using DevExpress.AIIntegration.Wpf;
using DevExpress.Mvvm.UI.Interactivity;
// ...
public partial class MainWindow : Window {
    public MainWindow() {
        InitializeComponent();
        AddAIBehaviors();
    }
    void AddAIBehavior() {
        var translateBehavior = new DocumentTranslateInlineBehavior() {
            Languages = new List<LanguageInfo>() {
                new LanguageInfo() { Culture = new CultureInfo("de-DE") }
            }
        };
        var behavior = Interaction.GetBehaviors(preview);
        behavior.Add(translateBehavior);
    }
}

Imports System.Collections.Generic
Imports System.Globalization
Imports DevExpress.AIIntegration
Imports DevExpress.AIIntegration.Wpf
Imports DevExpress.Mvvm.UI.Interactivity
' ...
Partial Public Class MainWindow
    Inherits Window

    Public Sub New()
        InitializeComponent()
        AddAIBehaviors()
    End Sub
    Private Sub AddAIBehavior()
        Dim translateBehavior = New DocumentTranslateInlineBehavior() With {
            .Languages = New List(Of LanguageInfo)() From {
                New LanguageInfo() With {.Culture = New CultureInfo("de-DE")}
            }
        }
        Dim behavior = Interaction.GetBehaviors(preview)
        behavior.Add(translateBehavior)
    End Sub
End Class