SharePoint 2013 - Export Termstore to CSV using CSOM

 using Microsoft.SharePoint.Client;
 using Microsoft.SharePoint.Client.Taxonomy;  
 using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Security;  
 using System.Text;  
 using System.Threading.Tasks;  
 namespace ExportTermStoreToCSV  
 {  
   class Program  
   {  
     static void Main(string[] args)  
     {  
       var sbCSV = new StringBuilder();  
       #region get Termstore Online  
       Console.Write("Enter Site URL:-");  
       string SiteUrl = Console.ReadLine();  
       ClientContext cc = new ClientContext(SiteUrl);  
       Console.Write("Enter User Name:-");  
       string Username = Console.ReadLine();  
       Console.Write("Enter Password:-");  
       string passwordOnline = Console.ReadLine();  
       var securePasswordOnline = new SecureString();  
       foreach (char c in passwordOnline)  
       {  
         securePasswordOnline.AppendChar(c);  
       }  
       cc.Credentials = new SharePointOnlineCredentials(Username, securePasswordOnline);  
       TaxonomySession taxonomySession = TaxonomySession.GetTaxonomySession(cc);  
       TermStore termStore = taxonomySession.GetDefaultSiteCollectionTermStore();  
       cc.Load(termStore,  
           store => store.Name,  
           store => store.Groups.Include(  
             group => group.Name,  
             group => group.TermSets.Include(  
               termSet => termSet.Name, termSet => termSet.Terms.Include(  
                 term => term.Name, term => term.TermsCount, term => term.LocalCustomProperties, term => term.Terms.Include  
                   (  
                   childTerm => term.Name,  
                   childTerm => term.TermsCount,  
                   childTerm => term.LocalCustomProperties,  
                   childTerm => term.Terms.Include(  
                     childTerm2 => term.Name,  
                     childTerm2 => term.TermsCount,  
                     childTerm2 => term.LocalCustomProperties,  
                     childTerm2 => term.Terms.Include(  
                         childTerm3 => term.Name,  
                         childTerm3 => term.TermsCount,  
                         childTerm3 => term.LocalCustomProperties,  
                         childTerm3 => term.Terms.Include(  
                           childTerm4 => term.Name,  
                           childTerm4 => term.TermsCount,  
                           childTerm4 => term.LocalCustomProperties,  
                           childTerm4 => term.Terms.Include(  
                             childTerm5 => term.Name,  
                             childTerm5 => term.TermsCount,  
                             childTerm5 => term.LocalCustomProperties,  
                             childTerm5 => term.Terms.Include(  
                               childTerm6 => term.Name,  
                               childTerm6 => term.TermsCount,  
                               childTerm6 => term.LocalCustomProperties)))))))  
             )  
           )  
       );  
       cc.ExecuteQuery();  
       if (taxonomySession != null)  
       {  
         if (termStore != null)  
         {  
           sbCSV.AppendLine("TermSetName, Level 1, Level 2, Level 3, Level 4, Level 5, Level 6, Level 7");  
           foreach (TermGroup group in termStore.Groups)  
           {  
             Console.WriteLine("Group " + group.Name);  
             sbCSV.AppendLine(group.Name + ",,,,,,,");  
             foreach (TermSet termSet in group.TermSets)  
             {  
               Console.WriteLine("TermSet " + termSet.Name);  
               sbCSV.AppendLine(group.Name + "," + termSet.Name + ",,,,,,");  
               foreach (Term term in termSet.Terms)  
               {  
                 // Writes root-level terms only.  
                 Console.WriteLine("Term " + term.Name);  
                 sbCSV.AppendLine(group.Name + "," + termSet.Name + "," + term.Name + ",,,,,");  
                 if (term.TermsCount > 0)  
                 {  
                   string str = group.Name + "," + termSet.Name + "," + term.Name;  
                   BindTermStore(term.Terms, str, sbCSV);  
                 }  
               }  
             }  
           }  
         }  
       }  
       #endregion  
       System.IO.File.WriteAllText(@"D:\Whatever.csv", sbCSV.ToString());  
     }  
     /// <summary>  
     /// Recursive method to check child terms  
     /// </summary>  
     /// <param name="termColl">TermCollection termColl</param>  
     /// <param name="str">string strTermName</param>  
     /// <param name="sbs">StringBuilder sbs</param>  
     private static void BindTermStore(TermCollection termColl, string str, StringBuilder sbs)  
     {  
       foreach (Term term in termColl)  
       {  
         // Writes root-level terms only.  
         Console.WriteLine("Term " + term.Name);  
         sbs.AppendLine(str + "," + term.Name);  
         if (term.TermsCount > 0)  
         {  
           string sss = str + "," + term.Name;  
           BindTermStore(term.Terms, sss, sbs);  
         }  
       }  
     }  
   }  
 }