CRR0047 - The type can be moved to a separate file

//PluginManager.cs 

using System;
using System.Collections.Generic;

namespace MySolution
{
    public class PluginManager
    {
        public List<PluginInfo> Plugins { get; private set; }
        public void AddPlugin(PluginInfo plugin)
        {
            if (Plugins == null)
                Plugins = new List<PluginInfo>();
            Plugins.Add(plugin);
        }
    }
    public class PluginInfo
    {
        public PluginInfo(string name, string path, bool enabled)
        {
            Name = name;
            Path = path;
            Enabled = enabled;
        }
        public string Name { get; set; }
        public string Path { get; set; }
        public bool Enabled { get; set; }
    }
}

'PluginManager.vb 
Imports System
Imports System.Collections.Generic

Namespace MySolution
    Public Class PluginManager
        Public Property Plugins As List(Of PluginInfo)

        Public Sub AddPlugin(ByVal plugin As PluginInfo)
            If Plugins Is Nothing Then Plugins = New List(Of PluginInfo)()
            Plugins.Add(plugin)
        End Sub 
    End Class 

    Public Class PluginInfo
        Public Sub New(ByVal name As String, ByVal path As String, ByVal enabled As Boolean)
            name = name
            path = path
            enabled = enabled
        End Sub 

        Public Property Name As String 
        Public Property Path As String 
        Public Property Enabled As Boolean 
    End Class 
End Namespace 

//PluginManager.cs 

using System;
using System.Collections.Generic;

namespace MySolution
{
    public class PluginManager
    {
        public List<PluginInfo> Plugins { get; private set; }
        public void AddPlugin(PluginInfo plugin)
        {
            if (Plugins == null)
                Plugins = new List<PluginInfo>();
            Plugins.Add(plugin);
        }
    }
}

'PluginManager.vb 
Imports System
Imports System.Collections.Generic

Namespace MySolution
    Public Class PluginManager
        Public Property Plugins As List(Of PluginInfo)

        Public Sub AddPlugin(ByVal plugin As PluginInfo)
            If Plugins Is Nothing Then Plugins = New List(Of PluginInfo)()
            Plugins.Add(plugin)
        End Sub 
    End Class 
End Namespace 

//PluginInfo.cs 

using System;
using System.Collections.Generic;

namespace MySolution
{
    public class PluginInfo
    {
        public PluginInfo(string name, string path, bool enabled)
        {
            Name = name;
            Path = path;
            Enabled = enabled;
        }
        public string Name { get; set; }
        public string Path { get; set; }
        public bool Enabled { get; set; }
    }
}

'PluginInfo.cs 
Imports System
Imports System.Collections.Generic

Namespace MySolution
    Public Class PluginInfo
        Public Sub New(ByVal name As String, ByVal path As String, ByVal enabled As Boolean)
            Name = name
            Path = path
            Enabled = enabled
        End Sub 

        Public Property Name As String 
        Public Property Path As String 
        Public Property Enabled As Boolean 
    End Class 
End Namespace