Directorysearcher using pagesize instead of sizelimit error

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C#

WinForms

active-directory

Hi All,

This problem is throwing me through a loop because I don't understand what I'm doing wrong. When I try this search using PageSize=1000, I get a strange index out of bounds error on all of my properties queries. When I comment out PageSize and use Sizelimit, it works perfectly. I'm working with 12k users, so obviously Sizelimit won't work for me.

What I'm attempting to accomplish:
I have a textbox that I'm using as a search field and am trying to have that search filter the results in a listbox below it as a user types in a name.

My function:

<pre>     public void FillUsers()
        {
            DirectoryEntry entry = new DirectoryEntry("LDAP://<mydomain>", null, null, AuthenticationTypes.Secure);
            Dictionary<int, string> UserCollection= new Dictionary<int, string>();
            using (DirectorySearcher usearcher = new DirectorySearcher(entry))
            {
                //usearcher.PageSize = 1000;
                usearcher.SizeLimit = 500;
                usearcher.Filter = string.Format("(&(objectCategory=Person)(mail=*))");
                usearcher.PropertiesToLoad.Add("displayname");
                usearcher.PropertiesToLoad.Add("samaccountname");

                using (SearchResultCollection result = usearcher.FindAll())
                {
                    int count = 0;
                    foreach (SearchResult user in result)
                    {
                        if (user.Properties["DisplayName"].Count >= 0 && !string.IsNullOrEmpty(user.Properties["DisplayName"][0].ToString()) && user.Properties["samaccountname"].Count >= 0 && !string.IsNullOrEmpty(user.Properties["samaccountName"][0].ToString()))
                        {
                            count++;
                            string u = user.Properties["DisplayName"][0].ToString() + " (" + user.Properties["samaccountname"][0].ToString() + ")";
                            UserCollection.Add(count, u);
                        }
                    }
                }

                DataTable dt = new DataTable();

                dt.Columns.Add("Key", typeof(int));

                dt.Columns.Add("Value");

                foreach (KeyValuePair<int, string> pair in UserCollection)
                { 
                    dt.Rows.Add(pair.Key, pair.Value);
                }

                bs.DataSource = dt;

                AddMbrs_listBox.DisplayMember = "Value";
                AddMbrs_listBox.ValueMember = "Key";

                AddMbrs_listBox.DataSource = bs;
            }
            entry.Dispose();
        }

And the textchanged call:

private void Addmbr_search_TextChanged(object sender, EventArgs e)
        {
            if (Addmbr_search.Text != null)
            {
                bs.Filter = "Value LIKE '" + this.Addmbr_search.Text + "%'";
                FillUsers();
            }
        }

Any help or assistance you could provide would be awesome... I'm very new to C# so I'm sure I have tons to learn, but I've spent the past 7 hours getting nowhere trying to resolve it on my own (much to my dismay), so I figured it was time for some guidance :)

What I have tried:

A lot of what I tried is in the code still, after doing a lot of researching online... but I did the following:

- added the

if (user.Properties["DisplayName"].Count >= 0 && !string.IsNullOrEmpty(user.Properties["DisplayName"][0].ToString()) && user.Properties["samaccountname"].Count >= 0 && !string.IsNullOrEmpty(user.Properties["samaccountName"][0].ToString()))

statement based on a lot of forum feedback stating it was returning an empty collection, which it isn't - but felt it was good to have there anyway :)

- experimented with ServerPageTimeLimit and ServerTimeLimit, thinking maybe it was timing out my connection while trying to page, didn't seem to have any effect.

- Tried a workaround where I was using the searchbox text as an input variable + * and added it into the LDAP search filter so that it was OK to be returning SizeLimit=200. This "worked", but I *really* dislike the idea of making an LDAP call everytime the textbox updates.

At that point I decided I really need to get this to work the way it seems everyone else online has it working, so I can feed it into a DataSource and filter against it.