How to Unprotect or Un-Lock Excel Workbook and Worksheet using C#

We may sometimes need to Unlock or Unprotect the Excel Workbook and also Excel Worksheet to view and then perform some read, write operations using C#, for which below code will be very
useful.

using System;

using Excel = Microsoft.Office.Interop.Excel;

namespace Purush_Excel

{

    class Purush_Excel_UnprotectWorkBook_Sheet

    {

        static void Main(string[] args)

        {

            Excel.Application xlApp = new Excel.Application();

            Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(@"C:\Purush\Desktop\Test.xlsx");

            xlWorkbook.Unprotect("Purush_Password_Book");//Workbook Password

            Excel._Worksheet xlWorksheet = xlWorkbook.Sheets["Purush_Sheet1"];

            xlWorksheet.Unprotect("Purush_Password_Sheet");// Worksheet Password

            xlWorkbook.Save();

            xlWorkbook.Close();

         }

    }

}