VSTO

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Excel;
using System.Reflection;
 
namespace VSTO
{
    public partial class ThisAddIn
    {
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            //Add a new workbook
            Excel.Workbook excelApp = this.Application.Workbooks.Add();
 
            //Protect the worksheet with password
            ((Excel.Worksheet)excelApp.ActiveSheet).Protect("Spire"); 
 
            //Unprotect the worksheet specifying its password
            ((Excel.Worksheet)excelApp.ActiveSheet).Unprotect("Spire");  
         
            //Save the file
            excelApp.SaveAs("Result.xlsx");                      
           
        }
 
        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }
 
        #region VSTO generated code
 
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
         
        #endregion
    }
}

Spire.XLS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Spire.Xls;
 
namespace Spire.XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //Initialize a new instance of workbook
            Workbook wb = new Workbook();
 
            //Protect the worksheet with password
            Worksheet sheet = wb.Worksheets[0];
            sheet.Protect("Spire", SheetProtectionType.None);
 
            //Unprotect the worksheet specifying its password
            sheet.Unprotect("Spire");
 
            //Save and Launch
            wb.SaveToFile("Result.xlsx");
            System.Diagnostics.Process.Start("Result.xlsx");
 
 
        }
    }
}

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