How to Delete file one by one in loop

public void CheckFileType(string directoryPath)
       {
           IEnumerator files = Directory.GetFiles(directoryPath).GetEnumerator();
           while (files.MoveNext())
           {

               //get file extension
               string fileExtension = Path.GetExtension(Convert.ToString(files.Current));

               //get file name without extenstion
               string fileName = Convert.ToString(files.Current).Replace(fileExtension, string.Empty);

               //Check for JPG File Format
               if (fileExtension == ".tiff" || fileExtension == ".TIFF") // or // ImageFormat.Jpeg.ToString()
               {
                   try
                   {
                       //OCR Operations ...

                       MODI.Document md = new MODI.Document();
                       md.Create(Convert.ToString(files.Current));
                       md.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);
                       string myText = "";
                       for (int i = 0; i < md.Images.Count; i++)
                       {
                           MODI.Image image = (MODI.Image)md.Images[i];

                           myText = myText + image.Layout.Text.ToString();

                       }


                     txtPatientNm.Text = Extracttext(myText).ToString();


                   }
                   catch (Exception)
                   {

                   }
               }
           }
       }