private void InitializeProviders()
        {
            providers = new List <ActiveDirectoryMembershipProvider>();
            StringBuilder strBuilder = new StringBuilder();

            for (int i = 0; i < connectionStrings.Length; ++i)
            {
                string currentStr = connectionStrings[i].Trim();
                ActiveDirectoryMembershipProvider provider = new ActiveDirectoryMembershipProvider();
                try
                {
                    NameValueCollection currConfig = new NameValueCollection(config);
                    currConfig["connectionStringName"] = currentStr;
                    provider.Initialize(strProviderName, currConfig);
                    providers.Add(provider);
                }
                catch (Exception e)
                {
                    strBuilder.Append(currentStr + ": " + e.Message + "\n");
                    if ((i == connectionStrings.Length - 1) && (providers.Count == 0))
                    {
                        throw new Exception(strBuilder.ToString(), e);
                    }
                }
            }
        }