求救：向GridView中添加一行数据，其他的数据全部跟着更改，高手帮忙！谢谢

namespace MeApp
{
    public partial class editwe_2 : System.Web.UI.Page
    {
        dataOperate mydo = new dataOperate();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Bind();
            }        }        public void Bind()
        {
            string strCon = ConfigurationManager.AppSettings["Constr"].ToString();
            string sql = "select * from WeatherInfo  ";
            SqlConnection con = new SqlConnection(strCon);
            SqlDataAdapter da = new SqlDataAdapter(sql, con);
            DataSet ds = new DataSet();
            con.Open();
            da.Fill(ds);
            gvweather.DataSource = ds;
            gvweather.DataKeyNames = new string[] { "weinfo_id" };
            gvweather.DataBind();
            con.Close();
        }
        protected void gvweather_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            gvweather.PageIndex = e.NewPageIndex;                //设置当前页的索引
            Bind();                               //重新绑定GridView控件
        }
        protected void gvweather_RowEditing(object sender, GridViewEditEventArgs e)
        {
            gvweather.EditIndex = e.NewEditIndex;
            Bind();
        }
        protected void gvweather_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            string id = gvweather.DataKeys[e.RowIndex].Value.ToString();
            string date = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim();
            string time = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim();
            string area = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim();
            string weather = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[4].Controls[0])).Text.ToString().Trim();
            string tem = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[5].Controls[0])).Text.ToString().Trim();
            string hum = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[6].Controls[0])).Text.ToString().Trim();
            string air = ((TextBox)(gvweather.Rows[e.RowIndex].Cells[7].Controls[0])).Text.ToString().Trim();
            string sql = "update WeatherInfo set weinfo_date='" + date + "',weather_time='" + time +
                    "',area='" + area + "',weather='" + weather + "',temperature='" + tem + "',huminity='" + hum +
                    "',airQuality='" + air + "'";
            try
            {
                mydo.updateData(sql);
                gvweather.EditIndex = -1; 
            }
            catch
            {
                Response.Write("<Script language=javascript>alert('修改失败！')；</script>");
            }
        }        protected void gvweather_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string id = gvweather.DataKeys[e.RowIndex].Value.ToString();
            string sql = "delete from WeatherInfo where weinfo_id='" + id + "'";
            mydo.adlData(sql);                                                   //将此条图书信息删除
            Bind();                                                                 //调用自定义方法重新绑定图书信息        
        }        protected void gvweather_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
        {
            gvweather.EditIndex = -1;
            Bind();
        }
    }
}