excel导入SQL数据库，的Button事件问题

excel导入SQL数据库，有2个按钮事件，Button1_Click把数据在表中显示下，不对数据库进行操作，Button2_Click对数据库进行操作，但是总是出错，无效参数，如果单独执行Button2_Click对数据库进行操作是可以的，执行Button1_Click也可以。但是先Button1_Click在Button2_Click就无效参数了。是不是执行2次string sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + FileUpload1.PostedFile.FileName.ToString() + ";" + "Extended Properties=\"Excel 8.0;\"";
        OleDbConnection objConn = new OleDbConnection(sConnectionString);
        objConn.Open();
        OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [Sheet1＄]", objConn);
        OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
        objAdapter1.SelectCommand = objCmdSelect;
        DataSet objDataset1 = new DataSet();
        objAdapter1.Fill(objDataset1);
不行啊，那位高手帮解决下，2天了SqlConnection conn = new SqlConnection("Data Source=.;Database=hhxy_gzcx;User ID=sa;PWD=11");    protected void Page_Load(object sender, EventArgs e)
    {
   
    }    protected void Button1_Click(object sender, EventArgs e)
    {
        string sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + FileUpload1.PostedFile.FileName.ToString() + ";" + "Extended Properties=\"Excel 8.0;\"";
        OleDbConnection objConn = new OleDbConnection(sConnectionString);
        objConn.Open();
        OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [Sheet1＄]", objConn);
        OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
        objAdapter1.SelectCommand = objCmdSelect;
        DataSet objDataset1 = new DataSet();
        objAdapter1.Fill(objDataset1);
        GridView1.DataSource = objDataset1;
        GridView1.DataBind();   
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        string sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=" + FileUpload1.PostedFile.FileName.ToString() + ";" + "Extended Properties=\"Excel 8.0;\"";
        OleDbConnection objConn = new OleDbConnection(sConnectionString);
        objConn.Open();
        OleDbCommand objCmdSelect = new OleDbCommand("SELECT * FROM [Sheet1＄]", objConn);
        OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
        objAdapter1.SelectCommand = objCmdSelect;
        DataSet objDataset1 = new DataSet();
        objAdapter1.Fill(objDataset1);
        DataTable dt = objDataset1.Tables[0];
        DataView myView = new DataView(dt);
        SqlCommand cmd = conn.CreateCommand();
        cmd.CommandText = "INSERT INTO user_table values(@姓名,@密码)";
        int count=0;
        try
        {
            foreach (DataRowView myDrv in myView)
            {
                count++;
                if (conn.State.ToString() != "Closed")
                    conn.Close();
                cmd.Parameters.Clear();                SqlParameter 姓名 = cmd.Parameters.Add("@姓名", SqlDbType.Char);
                SqlParameter 密码 = cmd.Parameters.Add("@密码", SqlDbType.Char);                姓名.Direction = ParameterDirection.Input;
                密码.Direction = ParameterDirection.Input;                姓名.Value = myDrv[0].ToString().Trim();
                密码.Value = myDrv[1].ToString().Trim();
                conn.Open();                cmd.ExecuteNonQuery();//写入SQL数据库            }
            Page.Response.Write("<script>alert('导入成功')</script>");
        }
        catch (SqlException ex)
        {
            Page.Response.Write(ex.ToString());
            Page.Response.Write("<script>alert('添加第" + count.ToString() + "个学生时数据出错，请检查数据!')</script>");
            objConn.Close();//关闭EXCEL的连接
        }
        finally
        {
            objConn.Close();//关闭EXCEL的连接
            conn.Close();
        }
    }