c# LDAP check user is locked or not

How to check an active directory user is locked or not using c#:

//SOME GLOBAL DEFINITION

public const string userdn = "10.0.0.4/CN=MyUserAcc,OU=PORTAL,DC=TEST,DC=entst,DC=local";

public const string DCUserName = "TEST\\admin"; //Admin Account for query

public const string DCPassWord = "secret";

//USAGE

bool value= LDAPHelper.Users.IsLocked(userdn, DCUserName, DCPassWord);

//CODE

public static bool IsLocked(string userDn,string adminuser,string adminpass )

{

    try

    {

        DirectoryEntry user = new DirectoryEntry(userDn,adminuser,adminpass);

        string attribName = "msDS-User-Account-Control-Computed";

        user.RefreshCache(new string[] { attribName });

        const int UF_LOCKOUT = 0x0010;

        int userFlags = (int)user.Properties[attribName].Value;

        if ( (userFlags & UF_LOCKOUT) == UF_LOCKOUT)

        {

            // if this is the case, the account is locked out

            return true;

        }

        return false;

    }

    catch

    {

        return false;

    }

}