Getting User Division from Active Directory

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ASP.NET

directory

LDAP

Hello,

I am attempting to get the Get User Division from Active Directory. I am having problem returning the User Division after I get the Get User Group Memberships. I am only looking for the unique group membership to determine what division the User is apart of. Error Message is below the code.

private string GetCurrentDomainPath()
        {
            DirectoryEntry de =
               new DirectoryEntry("LDAP://RootDSE");

            return "LDAP://" +
               de.Properties["defaultNamingContext"][0].
                   ToString();
        }

        private bool DoUserExistingInAD(string strUser)
        {

            bool result = false;

            DirectoryEntry obEntry = new DirectoryEntry(GetCurrentDomainPath());
            DirectorySearcher srch = new DirectorySearcher(obEntry, "(SAccountName=" + strUser + ")");
            SearchResult res = srch.FindOne();
            if (null != res)
            {
                result = true;
            }

            return result;

        }

        private StringCollection GetUserGroupMembership(string strUser)
        {

            StringCollection groups = new StringCollection();
            try
            {

                DirectoryEntry obEntry = new DirectoryEntry(
                GetCurrentDomainPath());
                DirectorySearcher srch = new DirectorySearcher(obEntry,
                    "(SAccountName=" + strUser + ")");
                SearchResult res = srch.FindOne();
                if (null != res)
                {
                    DirectoryEntry obUser = new DirectoryEntry(res.Path);
                    // Invoke Groups method.
                    object obGroups = obUser.Invoke("Groups");
                    foreach (object ob in (IEnumerable)obGroups)
                    {
                        // Create object for each group.
                        DirectoryEntry obGpEntry = new DirectoryEntry(ob);
                        groups.Add(obGpEntry.Name);
                    }
                }
            }
            catch (Exception ex)
            {
                Trace.Write(ex.Message);
            }
            return groups;
        }

  
           private ArrayList  GetUserDivision(String strUser)
           {
          // string[] userGroup;
           ArrayList userGroup = new ArrayList();
           string userGroupTemp = string.Empty;
           string _memberOf = string.Empty;
           

            try {

                foreach (string MemberOf in GetUserGroupMembership(strUser))
                {
                    if (MemberOf.Contains("Cn="))
                    {
                        //User is affiliated with "EASTREGION-W"
                        if (_memberOf.Contains("CN=EASTREGION-W"))
                        {
                            userGroupTemp = "EASTREGION-W";
                            userGroup = userGroupTemp.Split('/').ToArray();
                            return userGroup;
                        }

                        //User is affiliated with "EASTREGION-A"
                        else if (_memberOf.Contains("CN=EASTREGION-A"))
                        {
                            userGroupTemp = "EASTREGION-A";
                            userGroup = userGroupTemp.Split('/').ToArray();
                            return userGroup;
                        }

                        //User is affiliated with "EASTREGION-O"
                        else if (_memberOf.Contains("CN=EASTREGION-O"))
                        {
                            userGroupTemp = "EASTREGION-O";
                            userGroup = userGroupTemp.Split('/').ToArray();
                            return userGroup;
                        }

                        //User is affiliated with "EASTREGION-R"
                        else if (_memberOf.Contains("CN= EASTREGION-R"))
                        {
                            userGroupTemp = "EASTREGION-R";
                            userGroup = userGroupTemp.Split('/').ToArray();
                            return userGroup;
                        }
                        //User is affiliated with "EASTREGION-S"
                        else if (_memberOf.Contains("EASTREGION-S"))
                        {
                            userGroupTemp = "EASTREGION-S";
                            userGroup = userGroupTemp.Split('/').ToArray();
                            return userGroup;
                        }

                    }
                }
            }

            catch (Exception ex)
            {
                Trace.Write(ex.Message);
            } 

string[] string.Split(params char[] separator) (params char[] separator) (+5 overload(s))

Returns a string array that contains the substrings in this instance that are delimited by elements of a specified Unicode character array.

Error:
Cannot implicitly convert type 'string[]' to 'System.Collections.ArrayList'