dotnet / dotnet/winforms

ADO.NET DataSet lacks byte[] type in DataColumn properties

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area-VSDesigner untriaged
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Description

### Environment

Microsoft Visual Studio 2026
Version: 18.2.0

### .NET version

.NET 8

### Did this work in a previous version of Visual Studio and/or previous .NET release?

Works on .NET Framework

### Issue description

In the project targeting .NET 8, it is not possible to set up a DataColumn in the DataSet Designer with **byte[]** type.

`.NET Framework screenshot`

Image

`.NET 8 screenshot`

Image

### Steps to reproduce

1. Create a WinForms .NET project.
2. Add a New Item - DataSet.
3. Open the DataSet Designer, add a DataTable from the right-click menu, add a DataColumn to the table.
4. Go to the Properties -> DataType -> the **Byte[]** item is missing in the dropdown list.

Contributor guide

Open the contributing guide

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