internal static string GetDisplayName(HttpRequest request, string idParameter)
{
string text = request.QueryString[idParameter];
string result = string.Empty;
bool flag = false;
if (!text.IsNullOrBlank())
{
Identity identity = Identity.ParseIdentity(text);
if (identity != null)
{
if (string.Compare(identity.DisplayName, identity.RawIdentity) == 0)
{
identity = identity.ResolveByType(IdentityType.MailboxFolder);
}
if (identity != null)
{
result = identity.DisplayName;
}
}
else
{
flag = true;
}
}
else
{
flag = true;
}
if (flag)
{
throw new BadQueryParameterException(idParameter);
}
return(result);
}
