asp.net implement recursive method to remove menu and display in DropDownList (column form) _ Practical Tips

This article illustrates the method of ASP.net implementation recursive method to remove a menu and display it in DropDownList. Share to everyone for your reference, specific as follows:

The tree-shaped column display is shown in DropDownList form.

 protected void Page_Load (object sender, EventArgs e) {if (!
      IsPostBack) {DataTable table = Bllsite.getchannelnames (Currentuser.parkid);
    Bindchanneltype (table, 0, 0);
    }///recursive method takes private void Bindchanneltype (DataTable dt, int categoryid, int layer) {DataView DV = new DataView (DT); Dv. RowFilter = "pid=" + CategoryID. ToString ();  Filter if (CategoryID!= 0) {layer++///default to First level} foreach (DataRowView drv in DV) {string
      span = "";
        if (CategoryID!= 0) {for (int i = 0; i < layer i++)//parent menu does not indent {span + = "";
      span + = "└";
      } ListItem li = new ListItem (); Li. Text = span + drv["channelname"].
      ToString (); Li. Value = drv["Id"].
      ToString ();
      This.ddlChannel.Items.Add (LI);
    Bindchanneltype (DT, Convert.ToInt32 (drv["Id"]), layer); }
}

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I hope this article will help you to ASP.net program design.