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);