为什么我在行的编辑状态下，想取更改过的某个单元格的内容总是取不到，而是取到变化前的内容呢？

public partial class ConfigWeb : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        getdata();
    }
    public void getdata()
    {
        SqlConnection cn = new SqlConnection(@"Data Source=mobile;Initial Catalog=Maintain;Persist Security Info=True;User ID=sa;Password=56ssddf"));
        SqlCommand cmd = new SqlCommand("select * from BusinessConfig", cn);
        //SqlDataReader dr = cmd.ExecuteReader();
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        da.Fill(ds, "BusinessConfig");
        GridView1.DataSource = ds.Tables[0].DefaultView;
        GridView1.DataBind();
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();
    }
    protected void GridView1_PageIndexChanged(object sender, EventArgs e)
    {
        //GridView1.PageIndex=
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        GridView1.DataBind();
    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        GridView1.DataBind();
    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        int id = Convert.ToInt32(GridView1.DataKeys[e.RowIndex]["ID"]);//将正在编辑的这一行与对应的数据库中的那一行的ID取出
        string TaskName = ((TextBox)GridView1.Rows[e.RowIndex].Cells[0].Controls[0]).Text.ToString();
        string SourcePath = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text.ToString();
        string DestPath = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text.ToString();
        string Frequency=((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text.ToString();
        string Suffix = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text.ToString();
        string CityName = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text.ToString();
       
        Response.Write(CityName);
        string updatesql = "UPDATE BusinessConfig SET TaskName ='" + TaskName + "',SourceFilePath='" + SourcePath + "',DestFilePath ='" + DestPath + "',Frquency ='" + Frequency + "',Suffix ='" + Suffix + "' ,ProvinceName ='" + CityName + "'  WHERE ID=" + id.ToString();
        //string selectsql="select TaskName,SourceFilePath,DestFilePath,Frquency,Suffix,ProvinceName from BusinessConfig ";
        SqlConnection cn = new SqlConnection(@"Data Source=mobile;Initial Catalog=Maintain;Persist Security Info=True;User ID=sa;Password=56ssddf");
        cn.Open();
        SqlCommand cmd = new SqlCommand(updatesql, cn);
        cmd.ExecuteNonQuery();       
        GridView1.EditIndex = -1;
        getdata();
    }
}