"System.Xml.XmlAttribute cannot be used as: 'xml element'." while running my asmx service - asp.net

Question

I am trying to create a small asmx service with a method which will return some dummy data. I get the following error when I run the service:
"System.InvalidOperationException: System.Xml.XmlAttribute cannot be used as: 'xml element'."
My web method is as follows:
[WebMethod]
public SubmitCaseRequestResponse1 SubmitCaseRequest(SubmitCaseRequestRequest1 request)
{
var response = new SubmitCaseRequestResponse1
{
ResponseID = "456325898",
Success = true,
ValidationErrors = null
};
return response;
}
My SubmitCaseRequestResponse1 class:
public class SubmitCaseRequestResponse1
{
public string ResponseId { get; set; }
public bool Success { get; set; }
public ValidationError[] ValidationErrors { get; set; }
}
and the request class is :
public class SubmitCaseRequestRequest1
{
public AuthHeader AuthHeader { get; set; }
public SubmitCaseRequestRequest PostCaseDateRequest { get; set; }
}

Answer 1

I was supposed to serialize the complex type SubmitCaseRequestRequest1 and SubmitCaseRequestResponse1 . Needed to add [XmlElement] for the complex types and [XmlAttribute] for simple types
[System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://tempuri.org/")]
[Serializable]
public class SubmitCaseRequestRequest1
{
[XmlElement]
public AuthHeader AuthHeader { get; set; }
[XmlElement]
public SubmitCaseRequestRequest PostCaseDateRequest { get; set; }
}
[Serializable]
public class SubmitCaseRequestRequest
{
[XmlElement]
public Guid? RequestId { get; set; }
[XmlAttribute]
public string LCICourtNumber { get; set; }
[XmlAttribute]
public string CaseNumber { get; set; }
[XmlAttribute]
public string DebtorLastName { get; set; }
[XmlAttribute]
public string DateType { get; set; }
}