VB.NET or C# XML Serialization/Deserialization Order attribute

Trying to serialize/deserialize an object in a specific order by setting but the order never works. The XML is always serialized in alphabetical order. Here is the class I am using.

    <XmlElement(Order:=1)>
    Public Property ChkNum() As String
        Get
            Return Me.chkNumField
        End Get
        Set(value As String)
            Me.chkNumField = value
        End Set
    End Property

    '''<remarks/>
    <XmlElement(Order:=2)>
    Public Property AcctId() As String
        Get
            Return Me.acctIdField
        End Get
        Set(value As String)
            Me.acctIdField = value
        End Set
    End Property

    '''<remarks/>
    <XmlElement(Order:=3)>
    Public Property TranCode() As String
        Get
            Return Me.tranCodeField
        End Get
        Set(value As String)
            Me.tranCodeField = value
        End Set
    End Property

    '''<remarks/>
    ''<System.Xml.Serialization.XmlElement("TranAmt", Order:=4)>
    <XmlElement(Order:=4)>
    Public Property CurAmt() As CurAmt_Type
        Get
            Return Me.curAmtField
        End Get
        Set(value As CurAmt_Type)
            Me.curAmtField = value
        End Set
    End Property

My code looks like this Dim chkDat(1) As ChkData_Type chkDat(0) = New ChkData_Type chkDat(0).ChkNum = "00FF" chkDat(0).AcctId = "1000122703" chkDat(0).TranCode = "999" chkDat(0).CurAmt = New CurAmt_Type chkDat(0).CurAmt.Amt = "250.00"

The result after serialization comes in the below order AcctID,ChkNum,CurAmt and TranCode.

I have seen Order attribute working for others. Not sure what is wrong with the above code. Any help would be greatly appreicated.