how to put the progress bar value in a recursive function for c# windows application?

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C#

ASP.NET

Hi sir,
Tell me the steps to put the progress bar value in a recursive function. Consider the following scenarios, i have one folder path "d:\studentinfo" , it contains many subfolders, for that i have to search the pdf files in folders and subfolders of the folder path, i dont know how many files before the process starts. I need to show the progress bar, displaying how much process is completed. I have a recursive function, that search the pdf files in that folder path recursively, my requirement is to display the progress bar in that recursive function.

I shared my recursive function for your reference. Kindly give me the solution to get the progress bar in a recursive function.

//this is the recursive function
        public static void getDirsFiles(DirectoryInfo d)
        {
         //   this.backgroundWorker1.ReportProgress(i);
          //  System.Threading.Thread.Sleep(500);
            //create an array of files using FileInfo object
            FileInfo[] files;
            //get all files for the current directory
            files = d.GetFiles("*.pdf");

            //iterate through the directory and print the files
            foreach (FileInfo file in files)
            {
                i++;
                //get details of each file using file object
                String fileName = file.FullName;
                String fileSize = file.Length.ToString();
                String fileExtension = file.Extension;
                String fileCreated = file.LastWriteTime.ToString();

              //  HttpContext.Current.Response.Write(fileName + " " + fileSize + " " + fileExtension + " " + fileCreated + "<br><br>");
            }

            //get sub-folders for the current directory
            DirectoryInfo[] dirs = d.GetDirectories("*.*");

            //This is the code that calls 
            //the getDirsFiles (calls itself recursively)
            //This is also the stopping point 
            //(End Condition) for this recursion function 
            //as it loops through until 
            //reaches the child folder and then stops.

            //HttpContext.Current.Response.Write("<br>");

            foreach (DirectoryInfo dir in dirs)
            {
              //  HttpContext.Current.Response.Write("--------->>  " + dir.Name);
                getDirsFiles(dir);
            }

        }