c# 가져온 excel 파일 읽기, 대량 처리 데이터 순환

    
dt = FM_HR_ShiftMaintenanceManager.GetCsvToDataTable(strConn, excelName,"XJSQMonthlyImportExcelData");
            int iCount = dt.Rows.Count; StringBuilder sb = new StringBuilder();
            if (dt != null)
            {
                int loop = Convert.ToInt32(Math.Floor((iCount / 100) * 1.0));
                DlSoft.Liveflow.Common.Log.LogHelper.Logger.Write("loop :"+loop);
                if (loop < 1)
                {                    
                    for (int j = 0; j < iCount; j++)
                    {
                        if (!string.IsNullOrEmpty(dt.Rows[j][1].ToString())) {
                            sb.Append(dt.Rows[j][0].ToString() + "@@" + dt.Rows[j][1].ToString() + "$$");
                        }                        
                    }
                    ssql = string.Format(@"exec usp_UpdateXiuJiaSQMonthlyStatus '{0}'", sb.ToString());
                    int t = dbt.ExecuteNonQuery(ssql);
                }
                else
                {
                    for (int k = 0; k < loop; k++)
                    {
                        for (int l = 0; l < 100; l++)
                        {
                            if (!string.IsNullOrEmpty(dt.Rows[l + k * 100][1].ToString()))
                            {
                                sb.Append(dt.Rows[l + k * 100][0].ToString() + "@@" + dt.Rows[l + k * 100][1].ToString() + "$$");
                            }                            
                        }
                        if (!string.IsNullOrEmpty(sb.ToString())) {
                            ssql = string.Format(@"exec usp_UpdateXiuJiaSQMonthlyStatus '{0}'", sb.ToString());
                            int tt = dbt.ExecuteNonQuery(ssql);
                            sb.Remove(0, sb.Length);
                        }
                    }
                    for (int m = 0; m < iCount - loop * 100; m++)
                    {
                        if (!string.IsNullOrEmpty(dt.Rows[m + loop * 100][1].ToString()))
                        {
                            sb.Append(dt.Rows[m + loop * 100][0].ToString() + "@@" + dt.Rows[m + loop * 100][1].ToString() + "$$");
                        }                        
                    }
                    if (!string.IsNullOrEmpty(sb.ToString())) {
                        ssql = string.Format(@"exec usp_UpdateXiuJiaSQMonthlyStatus '{0}'", sb.ToString());
                        int ttt = dbt.ExecuteNonQuery(ssql);
                    }
                }
            }

   /// 

        ///  excel .xlsxs
        /// 
        ///  
        /// exec 
        /// excel 
        /// exce 
        /// 
        public static DataTable GetCsvToDataTable(string strConn, string excelName, string FillName)
        {
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            DataSet ds = new DataSet();
            OleDbDataAdapter odda = new OleDbDataAdapter(string.Format("select * from [" + excelName + "$]"), conn);  // ，  CSV 
            odda.Fill(ds, FillName);
            conn.Close();
            return ds.Tables[0];
        }