Trying to use system.windows.forms in C#

[JethroNull]

I've been using Powershell and want to start using C#. My plan is to start by converting some powershell code to C#. The first thing I am trying is a file dialog box. Simple I thought.

Powershell(which works):

$fd = New-Object system.windows.forms.openfiledialog

I tried various things in C# but it seems to come down to :

using System.Windows.Forms; //"Forms" underlines red in Visual Studio 2017

Compiler message :

The type or namespace name 'Forms' does not exist in the namespace 'System.Windows' (are you missing an assembly reference?)

Do I have version issues and how might I fix?

Here is "About" for Visual Studio

Microsoft Visual Studio Community 2017
Version 15.9.4
VisualStudio.15.Release/15.9.4+28307.222
Microsoft .NET Framework
Version 4.8.03752

Installed Version: Community

Application Insights Tools for Visual Studio Package 8.14.11009.1
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ASP.NET and Web Tools 2017 15.9.04012.0
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ASP.NET Web Frameworks and Tools 2017 5.2.60913.0
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Azure App Service Tools v3.0.0 15.9.03024.0
Azure App Service Tools v3.0.0

Azure Functions and Web Jobs Tools 15.9.02046.0
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C# Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
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Common Azure Tools 1.10
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JavaScript Language Service 2.0
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Microsoft Azure Tools 2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.10730.2

Microsoft Continuous Delivery Tools for Visual Studio 0.4
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Microsoft JVM Debugger 1.0
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Microsoft MI-Based Debugger 1.0
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Microsoft Visual Studio Tools for Containers 1.1
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NuGet Package Manager 4.6.0
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ProjectServicesPackage Extension 1.0
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ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

ResourcePackage Extension 1.0
ResourcePackage Visual Studio Extension Detailed Info

SQL Server Data Tools 15.1.61810.11040
Microsoft SQL Server Data Tools

TypeScript Tools 15.9.20918.2001
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools 2.10.0-beta2-63501-03+b9fb1610c87cccc8ceb74a770dba261a58e39c4a
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Visual F# Tools 10.2 for F# 4.5 15.8.0.0. Commit Hash: 6e26c5bacc8c4201e962f5bdde0a177f82f88691.
Microsoft Visual F# Tools 10.2 for F# 4.5

Visual Studio Code Debug Adapter Host Package 1.0
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Visual Studio Tools for Containers 1.0
Visual Studio Tools for Containers

Thanks

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