I want to load all data in to my DataTable.

Excel.Application ep = new Excel.Application();
          Excel.Workbook ewb = ep.Workbooks.Open(openFileDialog1.FileName);
          Excel.Worksheet ews = ewb.Sheets[1];
          Excel.Range range = ews.UsedRange;
          int rowCount = range.Rows.Count;
          int columnCount = range.Columns.Count;
          //READ DATA FROM EXCEL SHHET
          for (int i = 1; i <= rowCount; i++)
          {
              set_id();
              id = cmb_id.Text;
              int n = 0;
              for (int j = 1; j <= columnCount; j++)
              {
                  n = n + 1;
                  string str = Convert.ToString((range.Cells[i, j] as Excel.Range).Value2);
                //  times = (range.Cells[i, 19] as Excel.Range).Value2;
                  if (n == 2)
                  {
                      photo =txt_img_loc.Text + str + ".jpg";
                      try
                      {
                          pbx_photo.Image = Image.FromFile(photo);
                      }
                      catch { MessageBox.Show("Inalid path or image"); }
                  }
                  else if (n == 1)
                  {
                      seat_no = str;
                  }
                 .................
                  else if (n == 21)
                  {
                      //Convert.ToDateTime(str).ToString();
                      try
                      {
                          time = str;
                          //str1 = Convert.ToDateTime((range.Cells[i, j] as Excel.Range));
                      }
                      catch
                      {
                          //str1 = DateTime.Today.Date.ToShortDateString();
                      }
                  }
              }
              try
              {
                  //SAVE IMAGE INTO FOLDER ON STARTUPPATH
                  pbx_photo.Image.Save(Application.StartupPath + "\\Image\\" + cmb_id.Text + ".jpg");
              }
              catch
              {
                  pbx_photo.Image = Image.FromFile(Application.StartupPath + "\\Default\\User-icon.png");
                  pbx_photo.Image.Save(Application.StartupPath + "\\Image\\" + cmb_id.Text + ".jpg");
              }
              try
              {
                  qry = "insert into entry(ety_id,ety_seat_no,ety_name,ety_house_name,ety_father_guar,ety_age,ety_gender,ety_qualification,ety_blood_group," +
                          "ety_panchayath,ety_ward_unit,ety_location,ety_designation,ety_occupation,ety_office,ety_land_line,ety_mobile,ety_email," +
                          "ety_photo,ety_date) values('" + id + "','"+ seat_no +"','" + name + "','" + house + "'," +
                          "'" + father + "','" + age + "','" + sex + "','" + quali + "'," +
                          "'" + blood + "','" + panch + "','" + ward + "','" + loca + "'," +
                          "'" + design + "','" + occ + "','"+ office +"','" + land + "','" + mob + "'," +
                          "'" + email + "','" + photo + "','" + str1 + "')";
                  sql_cmd = new SqlCommand(qry, sql_con);
                  sql_con.Open();
                  sql_cmd.ExecuteNonQuery();
                  sql_con.Close();
                  add_id();//FUNCTION:ADD ITEMS IN CMB_ID
                  set_id();//FUNCTION:SET MEMBER ID
                  pbx_photo.Image = null;
              }
              catch (Exception ex)
              {
                  MessageBox.Show(ex.Message);
              }
          }