Admin/Addpro.aspx.cs

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using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Maticsoft.Model;

public partial class user_Addpro : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string userName = Convert.ToString(Session["userName"]);

        //=Convert.ToString(Session["qx"]);
        if (userName == "")
        {
            Response.Redirect("index.aspx");
        }
        if (!IsPostBack)
        {
            if (Request.QueryString["editpro"] != null)
            {
                int id = Convert.ToInt32(Request.QueryString["editpro"]);
                Maticsoft.BLL.product bll = new Maticsoft.BLL.product();
                Maticsoft.Model.product model = bll.GetModel(id);
                this.TextBox2.Text = model.protitle;
                this.WE_NewsContent.Text = model.procontent;
                this.DropDownList1.SelectedValue = Convert.ToString(model.classid);
                this.txtpic.Text = model.propic;

            }
            BindClass();

        }
    }
    void BindClass()
    {
        List<productclass> list = Maticsoft.BLL.productclass.get_List();
        foreach (productclass model in list)
        {
            ListItem li = new ListItem();
            li.Text = "╋" + model.productname;
            li.Value = model.id.ToString();
            DropDownList1.Items.Add(li);
            BindChild(model.id.ToString(), "├──");
        }
    }

    void BindChild(string ParentID, string separator)
    {
        List<productclass> list = Maticsoft.BLL.productclass.get_List(ParentID);
        foreach (productclass model in list)
        {
            ListItem li = new ListItem();
            li.Text = separator + model.productname;