please explain me this code : '------------------------------------------------------------------------------
' <auto-generated>
'     Dieser Code wurde von einem Tool generiert.
'     Laufzeitversion:4.0.30319.42000
'
'     Änderungen an dieser Datei können falsches Verhalten verursachen und gehen verloren, wenn
'     der Code erneut generiert wird.
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict Off
Option Explicit On

Imports Microsoft.ReportingServices.RdlExpressions.ExpressionHostObjectModel
Imports Microsoft.ReportingServices.ReportProcessing.ReportObjectModel
Imports Microsoft.SqlServer.Types
Imports Microsoft.VisualBasic
Imports System
Imports System.Convert
Imports System.Math
<Assembly: System.Reflection.AssemblyVersion("12.3.1404.0")> 


Public Class ReportExprHostImpl
    Inherits ReportExprHost
    
    Public Sub New(ByVal includeParameters As Boolean, ByVal parametersOnly As Boolean, ByVal reportObjectModel As Object)
        MyBase.New(reportObjectModel)
        If (parametersOnly = true) Then
            Return
        End If
        Me.m_textBoxHostsRemotable = New RemoteArrayWrapper(Of TextBoxExprHost)(New ActionDisplay_TextBoxExprHost())
    End Sub
    
    Public Class ActionDisplay_TextBoxExprHost
        Inherits TextBoxExprHost
        
        Public Sub New()
            MyBase.New
            Me.m_paragraphHostsRemotable = New RemoteArrayWrapper(Of ParagraphExprHost)(New Paragraph00_ParagraphExprHost())
            Me.ActionInfoHost = New ActionInfo_ActionInfoExprHost()
        End Sub
        
        Public Class Paragraph00_ParagraphExprHost
            Inherits ParagraphExprHost
            
            Public Sub New()
                MyBase.New
                Me.m_textRunHostsRemotable = New RemoteArrayWrapper(Of TextRunExprHost)(New TextRun00_TextRunExprHost())
            End Sub
            
            Public Class TextRun00_TextRunExprHost
                Inherits TextRunExprHost
                
                Public Overrides ReadOnly Property ColorExpr() As Object
                    Get
                        
                        #ExternalSource("Expr0end",0)
                        Return Iif(Parameters!IsPermittedApproveUpdate.Value, "Blue", Fields!WindowTextColor.Value)
                        
                        #End ExternalSource
                    End Get
                End Property
            End Class
        End Class
        
        Public Class ActionInfo_ActionInfoExprHost
            Inherits ActionInfoExprHost
            
            Public Sub New()
                MyBase.New
                Me.m_actionItemHostsRemotable = New RemoteArrayWrapper(Of ActionExprHost)(New Action0_ActionExprHost())
            End Sub
            
            Public Class Action0_ActionExprHost
                Inherits ActionExprHost
                
                Public Overrides ReadOnly Property DrillThroughReportNameExpr() As Object
                    Get
                        
                        #ExternalSource("Expr1end",0)
                        Return iif(Parameters!IsPermittedApproveUpdate.Value, "UpdateApprovalDialog ComputerId "&"NotUsed" &" UpdateId "&Parameters!UpdateId.Value, Nothing)
                        
                        #End ExternalSource
                    End Get
                End Property
            End Class
        End Class
    End Class
End Class