If you want to get the form field definition, you need to use DataClassInfoProvider.GetDataClassInfo(formClassName) to get the class information - then in the dataclass info object you should have the form fields definitions available and once you have this object, you can also access the data, for example:  
 ObjectQuery< BizFormItem > data = BizFormItemProvider.GetItems(formClassName);
// Loops through the form s data records
foreach (BizFormItem item in data)
{
    // Gets the values of the 'UserEmail' and 'UserMessage' text fields for the given data record
    string test = item.GetStringValue("FieldName", "");   
And/Or you can also take a look on the FormProvider methods.