net45 
namespace System.Windows.Forms
{
    public class MessageBox
}
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.NET
5.06.07.08.09.0
.NET Core
3.03.1
.NET Framework
1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net45
Assembly

System.Windows.Forms , Version=4.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs to set <UseWindowsForms>True</UseWindowsForms>.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API