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HTML
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TreeViewCheckboxesPostBack.aspx.cs" Inherits="WebApplication1.TreeViewCheckboxesPostBack" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server" OnLoad="Panel1_Load"></asp:Panel>
</div>
</form>
</body>
</html>
CODE BEHIND
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class TreeViewCheckboxesPostBack : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Panel1_Load(object sender, EventArgs e)
{
TreeView tv = new TreeView();
tv.ID = "MyID";
tv.ShowCheckBoxes = TreeNodeTypes.All;
for (int i = 0; i < 10; i++)
{
TreeNode tn = new TreeNode();
tn.NavigateUrl = "Test " + i.ToString();
tn.Text = "Test " + i.ToString();
tn.ShowCheckBox = true;
tv.Nodes.Add(tn);
}
Panel1.Controls.Add(tv);
Button btn = new Button();
btn.Text = "PostBack";
btn.ID = "PostBack";
btn.CausesValidation = false;
btn.Click += (s, en) =>
{
string checkBx = string.Empty;
foreach (TreeNode trN in tv.Nodes)
{
if (trN.Checked)
{
checkBx += trN.Value + ", ";
}
}
Session["CheckBoxes"] = checkBx;
};
Panel1.Controls.Add(btn);
}
}
}
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