更新数据表?

我想更新数据表中的一行,所以我要执行以下操作:

 protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
 {
    DataView dv = (DataView)Session["My_DataTable"];
    DataTable dt = dv.Table;
    int rowIndex = GridView1.Rows[e.RowIndex];
    dt.Rows[rowIndex]["FirstName"] = thenewfirstname;
    dt.Rows[rowIndex]["MI"] = thenewmi;
    dt.Rows[rowIndex]["LastName"] =thenewlastname;
    Session["My_DataTable"] = dv;
    //Reset the edit index.
    GridView1.EditIndex = -1;

    //Bind data to the GridView control.
    GridView1.DataSource = Session["My_DataTable"];
    GridView1.DataBind();
 }

基本的DataView/DataTable已正确更改,但GridView既包含编辑前的旧行,也包含编辑后的新行(即,它添加了一个包含新编辑的附加行!)。

...
Sammy S Samerson 
...

把它改成 Sammy E Samerson

...
Sammy S Samerson
Sammy E Samerson
...