Public Class SampleSection
   Inherits ConfigurationSection

   Public Sub New()
   End Sub 'New


    <ConfigurationProperty("fileName", _
    DefaultValue:="default.txt", _
    IsRequired:=True, _
    IsKey:=False), _
    StringValidator( _
    InvalidCharacters:=" ~!@#$%^&*()[]{}/;'""|\", _
    MinLength:=1, _
    MaxLength:=60)> _
    Public Property FileName() As String
        Get
            Return CStr(Me("fileName"))
        End Get
        Set(ByVal value As String)
            Me("fileName") = value
        End Set
    End Property


    <ConfigurationProperty("maxUsers", _
    DefaultValue:=10000, _
    IsRequired:=False), _
    LongValidator(MinValue:=1, _
    MaxValue:=10000000, _
    ExcludeRange:=False)> _
   Public Property MaxUsers() As Long
        Get
            Return Fix(Me("maxUsers"))
        End Get
        Set(ByVal value As Long)
            Me("maxUsers") = value
        End Set
    End Property

    <ConfigurationProperty("maxIdleTime", _
    DefaultValue:="0:10:0", _
    IsRequired:=False), _
    TimeSpanValidator(MinValueString:="0:0:30", _
    MaxValueString:="5:00:0", _
    ExcludeRange:=False)> _
    Public Property MaxIdleTime() As TimeSpan
        Get
            Return CType(Me("maxIdleTime"), TimeSpan)
        End Get
        Set(ByVal value As TimeSpan)
            Me("maxIdleTime") = value
        End Set
    End Property
End Class 'SampleSection 

public class SampleSection : 
    ConfigurationSection
{
    public SampleSection()
    {
    }

    [ConfigurationProperty("fileName", DefaultValue = "default.txt",
        IsRequired = true, IsKey = false)]
    [StringValidator(InvalidCharacters = " ~!@#$%^&*()[]{}/;'\"|\\",
        MinLength = 1, MaxLength = 60)]
    public string FileName
    {
        get
        {
            return (string)this["fileName"];
        }
        set
        {
            this["fileName"] = value;
        }
    }

    [ConfigurationProperty("maxUsers", DefaultValue = (long)10000,  
        IsRequired=false)]
    [LongValidator(MinValue = 1, MaxValue = 10000000,
        ExcludeRange = false)]
    public long MaxUsers
    {
        get
        {
            return (long)this["maxUsers"];
        }
        set
        {
            this["maxUsers"] = value;
        }
    }

    [ConfigurationProperty("maxIdleTime",
        DefaultValue = "0:10:0",
        IsRequired = false)]
    [TimeSpanValidator(MinValueString = "0:0:30", 
        MaxValueString = "5:00:0",
        ExcludeRange = false)]
    public TimeSpan MaxIdleTime
    {
        get
        {
            return (TimeSpan)this["maxIdleTime"];
        }
        set
        {
            this["maxIdleTime"] = value;
        }
    }
}