Added new kb article resolving-namespace-conflicts

Author: KB Bot

Diff for: knowledge-base/resolving-namespace-conflicts.md

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+---
+title: Resolving Namespace Conflicts in RadSpreadProcessing for Document Processing
+description: This article demonstrates how to resolve namespace conflicts when using RadSpreadProcessing in a .NET Core project with both .NET Standard and .NET Framework versions installed.
+type: how-to
+page_title: How to Fix Namespace Conflicts in RadSpreadProcessing for Document Processing
+slug: radspreadprocessing-resolving-namespace-conflicts
+tags: radspreadprocessing, document processing, namespace, extern alias, .net core, .net standard
+res_type: kb
+ticketid: 1673450
+---
+
+## Environment
+
+<table>
+<tbody>
+<tr>
+<td>Product</td>
+<td>RadSpreadProcessing for Document Processing</td>
+</tr>
+</tbody>
+</table>
+
+## Description
+
+When working on a .NET Core project that utilizes both `Telerik.Documents.Spreadsheet` and `Telerik.Windows.Documents.Spreadsheet` packages, a namespace conflict arises due to the `Workbook` class existing in both packages. This conflict results in a compiler error, preventing successful compilation.
+
+This knowledge base article also answers the following questions:
+- How can I resolve type conflicts in .NET Core projects using Telerik Document Processing libraries?
+- What is the correct way to handle namespace conflicts when using Telerik Document Processing in mixed .NET environments?
+- How do I use the C# extern alias feature to differentiate between similar types in different assemblies?
+
+## Solution
+
+To resolve the compile-time error caused by the conflicting `Workbook` type in both assemblies, utilize the C# `extern alias` feature. This approach allows you to differentiate between assemblies and use types from both without conflict. Follow the steps below:
+
+1. **Assign Alias to NuGet Packages**
+   - For the `Telerik.Documents.Spreadsheet` NuGet package, set its alias to `StandardHelper` (or any preferred alias).
+   - For the `Telerik.Windows.Documents.Spreadsheet` NuGet package, set its alias to `FrameworkHelper` (or any preferred alias).
+
+2. **Use Extern Alias in Your Code**
+   - At the top of your source file where you intend to use the conflicting types, add the `extern alias` directive for each alias you assigned. This directive differentiates the assemblies, allowing you to reference each type explicitly.
+
+```csharp
+extern alias StandardHelper;
+//extern alias FrameworkHelper;
+
+using StandardHelper::Telerik.Windows.Documents.Spreadsheet.Model;
+//using FrameworkHelper::Telerik.Windows.Documents.Spreadsheet.Model;
+
+namespace YourNamespace
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+           Workbook workbook;
+        }
+    }
+}
+```
+
+By following these steps, you can successfully resolve the namespace conflict and use the `Workbook` class from both Telerik Document Processing libraries in your .NET Core project.
+
+## See Also
+
+- [Installation: NuGet Packages for Document Processing](https://docs.telerik.com/devtools/document-processing/getting-started/installation/nuget-packages)
+- [C# Language Reference: extern alias](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/extern-alias)
+- [What Versions of Document Processing Libraries are Distributed with the Telerik Products](https://docs.telerik.com/devtools/document-processing/knowledge-base/distribute-telerik-document-processing-libraries-net-versions)