รบกวนอธิบายเรื่อง function convert list เป็น datatable

class ConvertOverload
{

    public static string Number2String(byte number)
    {
        return number.ToString();
    }

    public static string Number2String(int number)
    {
        return number.ToString();
    }

    public static string Number2String(long number)
    {
        return number.ToString();
    }

    public static string Number2String(double number)
    {
        return number.ToString();
    }

}

class ConvertGeneric
{

    public static string Number2String(T Value) 
    {
        return Value.ToString();
    }
}

Class ConvertGeneric
	Public Shared Function Number2String (Of T)(ByVal Value As t) As String
		 Return Value.ToString()
	End Function
End Class

Public Shared Function ConvertToDataTable(Of T)(ByVal list As IList(Of T)) As DataTable

Class BaseClassA
	Public Function BeHappy () As String
		Return "หากว่าเราสบายจงปรบมือพลัน ป้าบๆ"
	End Function
End Class

Class ChildClassB
	Inherits BaseClassA

	Public Function BeHappy () As String
		 Return "ช้างๆ น้องเคยเห็นช้างป่าวจ้ะ"
	End Function
End Class

Class Person

	Public Function SingSomeSong(Of T As BaseClassA ) (Byval Song As T)
		Return Song.BeHappy() 
	End Funtion
End Class


    Sub Main()
        Dim SongA As New  BaseClassA()
        Dim SongB As New ChildClassB()
        
        Dim SomeOne As New Person()

        Dim SongText As String = SomeOne(SongA) & " : : & SomeOne(SongB)
    End Sub