Find synonyms using microsoftword in C#

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C#

ASP.NET

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Office.Interop.Word;
using WordApplication = Microsoft.Office.Interop.Word.Application;
using Microsoft.Office.Interop.Outlook;
namespace synonyms_try1
{
    public partial class Form1 : Form
    {
        Class1 c=new Class1();
        public Form1()
        {
            InitializeComponent();
        }

        private void bSubmit_Click(object sender, EventArgs e)
        {
              Microsoft.Office.Interop.Word.Application appWord;      // word application var
      object objNull = null;      // word object method calls require
                        // references to objects... create
                        // object for null and
      object objFalse = false;      // false entries and language

      object objLanguage = Microsoft.Office.Interop.Word.WdLanguageID.wdEnglishUS; // or appropritate lang!

      try
      {
            // Try opening Word app
            appWord = new Microsoft.Office.Interop.Word.Application();
      }
      catch(System.Exception exc)
      {
            // could not open word... show error message and return
            MessageBox.Show(exc.Message);
            return;
      }

      // clear synonym listbox lbSynonym
      lbSynonym.Items.Clear();

      // now call get_SynonymInfo to get SynonymInfo structure for
      // word entered in TextBox tbWord
      Microsoft.Office.Interop.Word.SynonymInfo si =
               appWord.get_SynonymInfo(tbWord.Text, ref (objLanguage));
        
      
      // first find out how many meanings were found for word
      int iMeanings = (int)si.MeaningCount;
      
      if(iMeanings > 0)
      {
            // one or more meanings were found... loop over each
            // (notice SynonymInfo.MeaningList is type System.ArrayList!)
          
          foreach (string strMeaning in (Array)si.MeaningList)
            {
                  // get Synonym List for each meaning... note that
                  // get_SynonymList takes an object ref, thus we
                  // must create objMeaning object
                  object objMeaning = strMeaning;
                  System.Array aSynonyms =
                        (System.Array)si.get_SynonymList(ref objMeaning);
                  foreach(string strSynonym in aSynonyms)
                  {
                        // loop over each synonym in ArrayList
                        // and add to lbSynonym ListBox
                        lbSynonym.Items.Add(strSynonym);
                  }
            }
      }
      else
      {
            // no meanings/synonyms found... set ListBox value to "NONE"
            lbSynonym.Items.Add("NONE");
      }
      // Clean up COM object
      c.Destroy(si);

      // quit WINWORD app
      appWord.Quit(ref objFalse, ref objNull, ref objNull);
      // clean up COM object
      c.Destroy(appWord);
      
}

        }
    }

i m using this code for finding synonyms but it give error

Unable to cast object of type 'System.String[*]' to type 'System.String[]'.

The error on that line......

foreach (string strMeaning in (Array)si.MeaningList)

Tell me the suggestion if u have.. i take this code from this link jczerk solution use in this link..
C#: WordNet / MS Word Object Library Spellchecker/SynonymInfo[^]

What I have tried:

i am trying to find the synonyms using microsoft word ....but it give the error