How to read pdf form fields created by Adobe life cycle designer in c# using iTextSharp?

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I'm trying to read pdf XFA form fields created by adobe life cycle designer using iTextSharp.I'm able to read other pdf form fields with this code but when I'm trying to read the fields using

AcroFields.Item

its shows count=0

Please suggest me how I solve my problem ? My code iis give below

public string P_InputStream = "~/pdf/test.pdf";

PdfReader reader = new PdfReader(Server.MapPath(P_InputStream));


AcroFields form = reader.AcroFields;
try
{
for (int page = 1; page <= reader.NumberOfPages; page++)
{
foreach (KeyValuePair<string,> kvp in form.Fields)
{
switch (form.GetFieldType(kvp.Key))
{
case AcroFields.FIELD_TYPE_CHECKBOX:
case AcroFields.FIELD_TYPE_COMBO:
case AcroFields.FIELD_TYPE_LIST:
case AcroFields.FIELD_TYPE_RADIOBUTTON:
case AcroFields.FIELD_TYPE_NONE:
case AcroFields.FIELD_TYPE_PUSHBUTTON:
case AcroFields.FIELD_TYPE_SIGNATURE:
case AcroFields.FIELD_TYPE_TEXT:
int fileType = form.GetFieldType(kvp.Key);
string fieldValue = form.GetField(kvp.Key);
string translatedFileName = form.GetTranslatedFieldName(kvp.Key);
break;
}
}
}

Thanks in advance.