public static void InsertHeaderFieldIfNeed(StringCollection source, string name, string theValue)
{
if (!StringUtils.IsEmpty(theValue))
{
HeaderFieldList fieldList = new HeaderFieldList();
int index = GetHeaderFieldList(0, source, fieldList);
if (!fieldList.ContainsField(name))
{
if ((index < 0) || (index > source.Count))
{
index = source.Count;
}
theValue = theValue.Replace("\r\n", "\r\n\t");
if (theValue[theValue.Length - 1] == '\t')
{
theValue = theValue.Substring(0, theValue.Length - 1);
}
foreach (string str in StringUtils.GetStringArray(string.Format("{0}: {1}", name, theValue)))
{
source.Insert(index, str);
index++;
}
}
}
}