detailsview 在编辑的时候使用dropdownlist

public   partial   class  _Default : System.Web.UI.Page 
... {
    protected void Page_Load(object sender, EventArgs e)
    ...{
        if (!this.IsPostBack)
        ...{
            bindData();
        }
    }
    public void bindData()
    ...{
        string strSql = ConfigurationManager.AppSettings["strcon"].ToString();
        SqlConnection con = new SqlConnection(strSql);
        SqlCommand cmd = new SqlCommand("select * from test where id =2",con);
        con.Open();
        SqlDataReader read = cmd.ExecuteReader();
        DetailsView1.DataSource=read;
        DetailsView1.DataBind();
        DropDownList drpsex = DetailsView1.FindControl("drpsex") as DropDownList;
        Label lblsex = DetailsView1.FindControl("lblsex") as Label;
        //SqlDataReader reader = bindToDrop();
        //drpsex.DataSource = reader;
        //drpsex.DataBind();
        //drpsex.SelectedIndex = drpsex.Items.IndexOf(drpsex.Items.FindByText(lblsex.Text.Trim())); //lblsex.Text.Trim();
        
    }
    protected void DetailsView1_ItemCommand(object sender, DetailsViewCommandEventArgs e)
    ...{
        //if (e.CommandName.Equals("Edit"))//实现一
        //{
        //    DetailsView1.ChangeMode(DetailsViewMode.Edit);
           
        //}
       
        //bindData();
    }
    protected void DetailsView1_ModeChanging(object sender, DetailsViewModeEventArgs e)
    ...{
        //DetailsView1.ChangeMode(DetailsViewMode.Edit);
        //bindData();
        //实现二
        if (DetailsView1.CurrentMode == DetailsViewMode.ReadOnly)
        ...{
            DetailsView1.ChangeMode(DetailsViewMode.Edit);
        }
        else if (DetailsView1.CurrentMode == DetailsViewMode.Edit)
        ...{
            DetailsView1.ChangeMode(DetailsViewMode.ReadOnly);
        }
        bindData();
        
    }

    public SqlDataReader bindToDrop()
    ...{
        string strSql = ConfigurationManager.AppSettings["strcon"].ToString();
        SqlConnection con = new SqlConnection(strSql);
        SqlCommand cmd = new SqlCommand("select distinct sex from test", con);
        con.Open();
        SqlDataReader read = cmd.ExecuteReader();
        return read;
    }

    protected void DetailsView1_ModeChanged(object sender, EventArgs e)
    ...{
       
    }
    protected void DetailsView1_DataBound(object sender, EventArgs e)
    ...{
        
    }
    protected void DetailsView1_PreRender(object sender, EventArgs e)
    ...{
        //实现dropdownlist 在编辑的时候显示一样的值
        if (this.IsPostBack)
        ...{
            if (DetailsView1.CurrentMode == DetailsViewMode.Edit)
            ...{
                DropDownList drpsex = DetailsView1.FindControl("drpsex") as DropDownList;
                Label lblsex = DetailsView1.FindControl("lblsex") as Label;
                drpsex.DataSource = bindToDrop();
                drpsex.DataBind();
                drpsex.SelectedValue = lblsex.Text.Trim();
            }
        }
    }
}

==============================================================================================
前台
  < form id = " form1 "  runat = " server " >
     < div >
         < asp:DetailsView ID = " DetailsView1 "  runat = " server "   AutoGenerateRows = " False "   Height = " 50px "  Width = " 125px "  OnItemCommand = " DetailsView1_ItemCommand "  OnModeChanging = " DetailsView1_ModeChanging "  OnModeChanged = " DetailsView1_ModeChanged "  OnDataBound = " DetailsView1_DataBound "  OnPreRender = " DetailsView1_PreRender " >
             < Fields >
                 < asp:TemplateField HeaderText = " Name " >
                     < EditItemTemplate >
                         < asp:TextBox ID = " TextBox1 "  runat = " server "  Text = ' <%# Bind("name") %> ' ></ asp:TextBox >
                     </ EditItemTemplate >
                     < InsertItemTemplate >
                         < asp:TextBox ID = " TextBox1 "  runat = " server "  Text = ' <%# Bind("name") %> ' ></ asp:TextBox >
                     </ InsertItemTemplate >
                     < ItemTemplate >
                         < asp:Label ID = " Label1 "  runat = " server "  Text = ' <%# Bind("name") %> ' ></ asp:Label >
                     </ ItemTemplate >
                 </ asp:TemplateField >
                 < asp:TemplateField HeaderText = " Sex " >
                     < EditItemTemplate >
                          < asp:DropDownList ID = " drpsex "  runat = " server "  DataSource = " <%# bindToDrop() %> "   DataTextField = " sex " ></ asp:DropDownList >
                     </ EditItemTemplate >
                     < InsertItemTemplate >
                         < asp:TextBox ID = " TextBox2 "  runat = " server "  Text = ' <%# Bind("sex") %> ' ></ asp:TextBox >
                     </ InsertItemTemplate >
                     < ItemTemplate >
                         < asp:Label ID = " Label2 "  runat = " server "  Text = ' <%# Bind("sex") %> ' ></ asp:Label >
                       
                     </ ItemTemplate >
                 </ asp:TemplateField >
                 < asp:TemplateField >
                    < ItemTemplate >
                       < asp:Label ID = " lblsex "  runat = " server "  Text = ' <%# Bind("sex") %> ' ></ asp:Label >
                    </ ItemTemplate >
                 </ asp:TemplateField >
                 < asp:TemplateField ShowHeader = " False " >
                     < EditItemTemplate >
                         < asp:Button ID = " Button1 "  runat = " server "  CausesValidation = " True "  CommandName = " Update "
                            Text = " 更新 "   />& nbsp; < asp:Button ID = " Button2 "  runat = " server "  CausesValidation = " False "
                                CommandName = " Cancel "  Text = " 取消 "   />
                     </ EditItemTemplate >
                     < ItemTemplate >
                         < asp:Button ID = " Button1 "  runat = " server "  CausesValidation = " False "  CommandName = " Edit "
                            Text = " 编辑 "   />
                     </ ItemTemplate >
                 </ asp:TemplateField >
             </ Fields >
         </ asp:DetailsView >
    
     </ div >
     </ form >