Save selected Tree view checked nodes to database

In this blog we will know how to save selected Tree view checked nodes to database.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Treeview_checkbox_checked_nodes._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

</head>

<body>

<div>

SaveSelectedValue:<br/>

<asp:TreeView ID="TreeView1" runat="server" ShowCheckBoxes="All">

</asp:TreeView>

<br />

<asp:Button ID="btn_save" runat="server" Text="SaveSelectedValue"

onclick="btn_save_Click"/>

</div>

</form>

</body>

</html>

Code Behind:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
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 System.Xml.Linq;
using System.Data.SqlClient;
namespace Treeview_checkbox_checked_nodes
{
public partial class _Default : System.Web.UI.Page
{
string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
string str;
SqlCommand com, com1;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bindtree();
}
}
void bindtree()
{
SqlConnection con = new SqlConnection(strConnString);
con.Open();
str = "Select * from Category";
com = new SqlCommand(str, con);
SqlDataReader reader = com.ExecuteReader();
com.Dispose();
string[,] ParentNode = new string[100, 2];
int count = 0;
while (reader.Read())
{
ParentNode[count, 0] = reader.GetValue(reader.GetOrdinal("Category_ID")).ToString();
ParentNode[count++, 1] = reader.GetValue(reader.GetOrdinal("CategoryName")).ToString();
}
reader.Close();
for (int loop = 0; loop < count; loop++)
{
TreeNode root = new TreeNode();
root.Text = ParentNode[loop, 1];
com1 = new SqlCommand("Select * from SubCategory where Category_ID =" + ParentNode[loop, 0], con);
SqlDataReader reader1 = com1.ExecuteReader();
while (reader1.Read())
{
TreeNode child = new TreeNode();
child.Text = reader1.GetValue(reader1.GetOrdinal("SubCategoryName")).ToString();
root.ChildNodes.Add(child);
}
reader1.Close();
TreeView1.Nodes.Add(root);
}
}
protected void btn_save_Click(object sender, EventArgs e)
{
Response.Write("<b>Seleted values of nodes:</b><br/>");
foreach (TreeNode item in this.TreeView1.CheckedNodes)
{
SqlConnection con = new SqlConnection(strConnString);
con.Open();
str = "Insert into Category1 values ('" + item.Text + "')";
com = new SqlCommand(str, con);
com.ExecuteNonQuery();
con.Close();
Response.Write(item.Value + "<br/>");
}
}
}
}