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According to other answers, I try to add project reference. I open the reference manager to find System.Windows.Forms and add it, but the project reference shows "No items found". So how can I add the reference? enter image description here

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    Looks like you have a console template. Try creating a new project using the WinForms template. Commented Jul 6, 2022 at 14:46
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    According to your Question Tags, you are specifically using C# 4.0 from 2010? Commented Jul 6, 2022 at 14:48
  • It's .NET-6.0 here, not C# 4.0. I have set a wrong tag. Commented Jul 6, 2022 at 14:59
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    In Solution Explorer, right-click the Project and select Edit Project File, then add <UseWindowsForms>true</UseWindowsForms> and change, if different, <TargetFramework>net6.0-windows</TargetFramework>. Rebuild. Commented Jul 6, 2022 at 17:19

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As Jimi's comment suggests, you cannot directly reference System.Windows.Forms.dll because it's part of the runtime. Instead, add the following to your project file: <UseWindowsForms>true</UseWindowsForms> and make sure the target framework is set as <TargetFramework>net6.0-windows</TargetFramework> (and not only net6.0), because Windows Forms is only supported on Windows.

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You need change <TargetFramework>net8.0</TargetFramework> to <TargetFramework>net8.0-windows</TargetFramework>, and add <UseWindowsForms>true</UseWindowsForms>

Update:
Following this proposal, I've update my .csproj file from project directory.
New lines in xml element are:

 <PropertyGroup> <TargetFramework>net9.0-windows</TargetFramework> <UseWindowsForms>true</UseWindowsForms> </PropertyGroup>

That helped me .

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