oledb如何远程读写excel2003文件数据

有两台机器A和B，A上有以建好的excel2003文件，需要从B上读写A的excel2003文件，从网上抄的代码改后：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
using System.Reflection;
using Excel = Microsoft.Office.Interop.Excel;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private OleDbConnection connection = null;
        private OleDbCommand cmd = null;
        private OleDbDataAdapter dataAdapter = null;
        private DataSet dataSet = null;
        private string connStr = "provider=microsoft.jet.oledb.4.0;data source=\\\\192.168.1.2\\c:\\data\\a.xls;extended properties='Excel 8.0;HDR=yes;IMEX=2'";
        private string selectStr = "select * from [Sheet1$]";
        private string cmdStr = null;

        private void button1_Click(object sender, EventArgs e)//读按钮
        {
            connection = new OleDbConnection(connStr);
            connection.Open();
            dataAdapter = new OleDbDataAdapter(selectStr, connection);
            dataSet = new DataSet();
            dataAdapter.Fill(dataSet);
            this.dataGridView1.DataSource = dataSet.Tables[0];
            connection.Close();

        }

        private void button2_Click(object sender, EventArgs e)//写按钮
        {
            connection = new OleDbConnection(connStr);
            connection.Open();
            cmdStr = "insert into [Sheet1$] values(" + textBox1.Text + "," + textBox2.Text + "," + textBox3.Text + ")";
            cmd = new OleDbCommand(cmdStr, connection);
            int row = cmd.ExecuteNonQuery();
            if (row > 0)
            {
                MessageBox.Show("保存成功");
            }
            else
            {
                MessageBox.Show("保存失败");
            }
            connection.Close();

        }
    }
}
运行时总是提示“无法更新，数据库或对象为只读”。
目前，使用B机器通过网络邻居已经可以浏览到A机器中的excel2003文件，也能够打开并修改成功。
A机器中的excel2003文件路径中的所有文件夹属性均已去掉只读属性，访问用户everyone已设成完全访问权限

共享文件的权限不够额，还有就是现在远程打开的都是只读文件，只有点击编辑之后才可以去修改啊。 是否可以换个访求，先从另一台机下载文件文件到本地，再上传或copy 到另外一台机