The project target is changed to .NET 5 due to the Breaking Change in DevExpress Blazor: https://supportcenter.devexpress.com/ticket/details/t982678/devexpress-blazor-components-no-longer-support-net-core-3-1

Author: Yulia DX

CS/BlazorApp_WordProcessing/BlazorApp_WordProcessing.csproj

@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net5.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="DevExpress.Blazor" Version="20.1.6" />
-    <PackageReference Include="DevExpress.Document.Processor" Version="20.1.11" />
+    <PackageReference Include="DevExpress.Blazor" Version="21.1.2-beta" />
+    <PackageReference Include="DevExpress.Document.Processor" Version="21.1.2-beta" />
     <PackageReference Include="MailKit" Version="2.9.0" />
   </ItemGroup>
   <ItemGroup>

CS/BlazorApp_WordProcessing/Startup.DevExpress.cs

@@ -1,14 +1,16 @@
 //------------------------------------------------------------------------------
+//<auto-generated>
 // Generated by the DevExpress.Blazor package.
 // To prevent this operation, add the DxExtendStartupHost property to the project and set this property to False.
 //
 // BlazorApp_WordProcessing.csproj:
 //
 // <Project Sdk="Microsoft.NET.Sdk.Web">
 //  <PropertyGroup>
-//    <TargetFramework>netcoreapp3.1</TargetFramework>
+//    <TargetFramework>net5.0</TargetFramework>
 //    <DxExtendStartupHost>False</DxExtendStartupHost>
 //  </PropertyGroup>
+//</auto-generated>
 //------------------------------------------------------------------------------
 using System;
 using Microsoft.Extensions.DependencyInjection;