2018-08-17 15:29:21.190 +08:00 [Error] Error in getting fullname for lsun
System.DirectoryServices.DirectoryServicesCOMException (0x80070035): The network path was not found.

   at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
   at System.DirectoryServices.DirectoryEntry.Bind()
   at System.DirectoryServices.DirectoryEntry.get_AdsObject()
   at System.DirectoryServices.PropertyValueCollection.PopulateList()
   at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName)
   at System.DirectoryServices.PropertyCollection.get_Item(String propertyName)
   at Company.Project.Common.Utility.LDAPUtility.QueryLDAPUserFullName(String userId) in C:CodeProjectbranchestestsrcDotNetCompany.Project.CommonUtilityLDAPUtility.cs:line 344
   at Company.Project.Common.Utility.LDAPUtility.GetUserFullName(String userId) in C:CodeProjectbranchestestsrcDotNetCompany.Project.CommonUtilityLDAPUtility.cs:line 239

private static string QueryLDAPUserFullName(string userId)
{
    string fullName = "";

    DirectoryEntry objDirEnt = new DirectoryEntry(ConstPrivileges.ADSPROVIDER + "://" + ConstPrivileges.DOMAIN + "/" + userId);

    if (objDirEnt.Children != null)
        fullName = objDirEnt.Properties["FullName"].Value.ToString();//Line 344

    return fullName;
}