我在网上找到一段将数据从Excel导入SQL的代码，但运行时始终提示有错误，说当前上下文中不存在名称“fp2”,不知为什么？请大家指导一下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;
using System.Data.OleDb;



namespace WindowsApplication10
{
    public partial class Form2 : Form
    {

    

        /// <summary> 
        /// 读取Excel文档 
        /// </summary> 
        /// <param name="Path">文件名称</param> 
        /// <returns>返回一个数据集</returns> 
        public DataSet ExcelToDS(string Path)
        {
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            string strExcel = "";
            OleDbDataAdapter myCommand = null;
            DataSet ds = null;
            strExcel = "select * from [Recovered_Sheet1$]";
            myCommand = new OleDbDataAdapter(strExcel, strConn);
            ds = new DataSet();
            myCommand.Fill(ds);
            return ds;
        }

        /// <summary> 
        /// 写入Excel文档 
        /// </summary> 
        /// <param name="Path">文件名称</param> 
        public bool SaveFP2toExcel(string Path)
        {
            try
            {
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                System.Data.OleDb.OleDbCommand cmd = new OleDbCommand();
                cmd.Connection = conn;
                //cmd.CommandText ="UPDATE [sheet1$] SET 姓名='2005-01-01' WHERE 工号='日期'"; 
                //cmd.ExecuteNonQuery (); 
                

                for (int i = 0; i < fp2.Sheets[0].RowCount - 1; i++)
                {
                    if (fp2.Sheets[0].Cells[i, 0].Text != "")
                    {
                        cmd.CommandText = "INSERT INTO [sheet1$] (省,区站号,站名,经度,纬度,水银槽海高) VALUES('" + fp2.Sheets[0].Cells[i, 0].Text + "','" +
                       fp2.Sheets[0].Cells[i, 1].Text + "','" + fp2.Sheets[0].Cells[i, 2].Text + "','" + fp2.Sheets[0].Cells[i, 3].Text +
                        "','" + fp2.Sheets[0].Cells[i, 4].Text + "','" + fp2.Sheets[0].Cells[i, 5].Text + "')";
                        cmd.ExecuteNonQuery();
                    }
                }
                conn.Close();
                return true;
            }
            catch
            {
                Console.WriteLine("Caught exception #2.");
            }
            finally
            {
                Console.WriteLine("Executing finally block.");
            }

        }
    }
}