protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowIndex != -1)
            {
                int id = e.Row.RowIndex;
                Button btnDel = (Button)e.Row.FindControl("btnDel"); //找刪除按鈕
                HtmlButton btnEdit = (HtmlButton)e.Row.FindControl("btnEdit");
                btnDel.CommandArgument = id.ToString();
            }
        }
        protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Del")
            {
                int rowIndex = Convert.ToInt32(e.CommandArgument);
                string id = this.GridView1.Rows[rowIndex].Cells[0].Text.ToString();

                string sql_del = "刪除的sql語句";
                //執行刪除操作
            }
       }

------解决方案--------------------
GridViewRow gr = this.GridView1.SelectedRow;
       string a = gr.Cells["name"].Text.ToString();

------解决方案--------------------
string name = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text;


------解决方案--------------------
为什么不把主键设上
GridView1.DataKeys="storeid";

id=GridView1.DataKeys[e.Index].value;

------解决方案--------------------
设置DataKeyNames  
然后用DataKeys