How to get a efficient way to the Exchange GAL (Global Adress List) with c#

Question

Hello,

I'm trying to get the GAL (Global Adress List) from Exchange to bind the result to a Listbox. My sample (see code) need to much time in large Active Directories. 

Has anyone an alternative solution (inclusive sample) for this problem that can be speed up the access (Maybe Webdav etc.)

Thanks,
little_Attila  

public ArrayList returngal()
        {
            ArrayList arrGal = null;

            try
            {
                DirectorySearcher objsearch = new DirectorySearcher();
                //string strrootdse = objsearch.SearchRoot.Path;

                DirectoryEntry objdirentry = new DirectoryEntry(LDAP://<URL2LDAP>);
                objsearch.Filter = "(&(mailNickname=*)(showinaddressbook=*))";
                objsearch.Filter = textBox1.Text;
                objsearch.SearchScope = System.DirectoryServices.SearchScope.Subtree;
                objsearch.PropertiesToLoad.Add("cn");
                objsearch.PropertyNamesOnly = true;
                objsearch.Sort.Direction = System.DirectoryServices.SortDirection.Ascending;
                objsearch.Sort.PropertyName = "cn";
                objsearch.PageSize = 500;
                SearchResultCollection colresults = objsearch.FindAll();
                arrGal = new ArrayList();
                foreach (SearchResult objresult in colresults)
                {
                    arrGal.Add(objresult.GetDirectoryEntry().Properties["cn"].Value);
                }
                objsearch.Dispose();
            }
            catch (System.Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            return arrGal;
        }

Answer 1

This is not the right forum for Exchange related questions. You should post in the Exchange Technet forums.

You could use Exchange Web Services to get the data, it might be faster.

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feroze
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