Server names cannot contain a space character

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C#

active-directory

I have a MVC5 application whereby the user has to login using domain credentials. When i hardcode the values for domain variables the application logs in without issue. For security reason i have set the variable values in a database table but when i attempt to retrieve using Linq i get an error Server names cannot contain a space character at this line :

PrincipalContext ctx = new PrincipalContext(ContextType.Domain, domainControllerService.GetDomain());

with stack trace :

<pre> at System.DirectoryServices.Protocols.LdapDirectoryIdentifier..ctor(String[] servers, Boolean fullyQualifiedDnsHostName, Boolean connectionless)
   at System.DirectoryServices.Protocols.LdapDirectoryIdentifier..ctor(String server)
   at System.DirectoryServices.Protocols.LdapConnection..ctor(String server)
   at System.DirectoryServices.AccountManagement.PrincipalContext.ReadServerConfig(String serverName, ServerProperties& properties)
   at System.DirectoryServices.AccountManagement.PrincipalContext.DoServerVerifyAndPropRetrieval()
   at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name, String container, ContextOptions options, String userName, String password)
   at System.DirectoryServices.AccountManagement.PrincipalContext..ctor(ContextType contextType, String name)
   at FBChecklist.Controllers.UserController.Login(DomainControllerViewModel model) in C:\Users\tshumae.FBC\source\repos\FBCHECKLIST\FBChecklist\Controllers\UserController.cs:line 49

This is the login code using hardcoded values :

public ActionResult Login()
        {
            var model = new DomainControllerViewModel();
           // LoginViewModel model = new LoginViewModel();
            return View(model);
        }

        // POST: User/Delete/5
        [HttpPost]
        public ActionResult Login(DomainControllerViewModel model)
        {
            try
            {
              PrincipalContext ctx = new PrincipalContext(ContextType.Domain, "MYDOMAIN.CORP");              
                // find a user
                UserPrincipal user = UserPrincipal.FindByIdentity(ctx, model.Username);
                if (user != null)
                {
                    // check user lockout state
                    if (user.IsAccountLockedOut())
                    {
                        ViewBag.Message = "Your account is locked out";
                    }
                    else
                    {
                        bool authentic = false;
                        try
                        {
                            DirectoryEntry entry = new DirectoryEntry("LDAP://XX.XX.XX.XX:XXX/OU=YYY,DC=YYY,DC=corp",, model.Username, model.Password);
                            DirectoryEntry ldapConnection = new DirectoryEntry("MYDOMAIN.CORP");
                            ldapConnection.Path = "LDAP://";
                            ldapConnection.Username ="myusername";
                            ldapConnection.Password = "mypassword";
                            ldapConnection.AuthenticationType = AuthenticationTypes.Secure;
....
....
               
            return View();
        }

And for retrieving from db im using :

 [HttpPost]
        public ActionResult Login(DomainControllerViewModel model)
        {
            try
            {
               PrincipalContext ctx = new PrincipalContext(ContextType.Domain, domainControllerService.GetDomain());
  ...
...                           
                        try
                        {

                            DirectoryEntry entry = new DirectoryEntry(domainControllerService.GetDirectoryEntry(), model.Username, model.Password);
                            DirectoryEntry ldapConnection = new DirectoryEntry(domainControllerService.GetDomain());
                            ldapConnection.Path = "LDAP://";
                            ldapConnection.Username =domainControllerService.GetUsername();
                            ldapConnection.Password = domainControllerService.GetPassword();
                            ldapConnection.AuthenticationType = AuthenticationTypes.Secure;
...
...
return View();
}

Repository (DomainControllerService.cs) :

public string GetDomain()
       {
           var domain = (from j in appEntities.DomainControllers
                         select new
                         {
                             j.Domain
                         });
           return domain.ToString();
       }

What I have tried:

I have tried a custom extension method that removes whitespace from a string as below but i still keep getting the same exception :

public string GetDomain()
       {
           var domain = (from j in appEntities.DomainControllers
                         select new
                         {
                             j.Domain
                         });
           string domaintostring = domain.ToString();
           string dom = Helpers.RemoveWhitespace(domaintostring);
           return dom;
       }

and the method :

<pre>public static string RemoveWhitespace(string input)
        {
            return new string(input.ToCharArray()
                .Where(c => !Char.IsWhiteSpace(c))
                .ToArray());
        }