//store a head content to a string buffer
protected virtual void StoreHead(StringBuilder sb)
{
if (sb == null)
{
throw new ArgumentNullException();
}
for (int i = 0; i < m_listFields.Count; i++)
{
MimeField aMimeField = (MimeField)m_listFields[i];
aMimeField.Store(sb);
}
sb.Append("\r\n");
}
