Expand TreeView when redirect

Question

Hi,

I have made a treeview, wich expand, when I remove the code:

root.NavigateUrl = "Default.aspx?id=" + ParentNode[loop, 0];

BUT I have to know, what Id (which node in the treeview the user select), to give the right input from the database.

I have stroggeld with this issue in many days now, but I still don't know what I shall do, so that when I redirect to Default, that it expand the treeview on that node, the user selected. Please can anybody help me?

My Code:

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

public partial class _Default : System.Web.UI.Page
{
private OleDbConnection connection = null;
public OleDbCommand command = null;
public string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\Inetpub\\wwwroot\\Test\\Menu3\\menu.mdb;";

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
fill_Tree();
}
}

void fill_Tree()
{
/*
* Fill the treeview control Root Nodes From Parent Table
* and child nodes from ChildTables
*/
connection = new OleDbConnection(connectionString);
connection.Open();

/*
* Query the database
*/
command = new OleDbCommand();
command.Connection = connection;

DataTable myDataTable = new DataTable();
myDataTable.Columns.Add(new DataColumn("CategoryID", Type.GetType("System.String")));
myDataTable.Columns.Add(new DataColumn("ParentCategoryID", Type.GetType("System.String")));
myDataTable.Columns.Add(new DataColumn("CategoryName", Type.GetType("System.String")));
command.CommandText = "SELECT * FROM CATEGORIES WHERE ParentCategoryID = 0";

command.Parameters.Clear();

/*
*Define and Populate the SQL DataReader
*/
OleDbDataReader myReader = command.ExecuteReader();

/*
* Dispose the SQL Command to release resources
*/
command.Dispose();

/*
* Initialize the string ParentNode.
* We are going to populate this string array with our ParentTable Records
* and then we will use this string array to populate our TreeView1 Control with parent records
*/

string[,] ParentNode = new string[100, 2];

/*
* Initialize an int variable from string array index
*/

int count = 0;

/*
* Now populate the string array using our SQL Datareader Sdr.
*/
while (myReader.Read())
{
ParentNode[count, 0] = myReader.GetValue(myReader.GetOrdinal("CategoryID")).ToString();
ParentNode[count++, 1] = myReader.GetValue(myReader.GetOrdinal("CategoryName")).ToString();
}

/*
* Close the SQL datareader to release resources
*/
//myReader.Close();

/*
* Now once the array is filled with [Parentid,ParentName]
* start a loop to find its child module.
* We will use the same [count] variable to loop through ChildTable
* to find out the number of child associated with ParentTable.
*/
for (int loop = 0; loop < count; loop++)
{
/*
* First create a TreeView1 node with ParentName and than
* add ChildName to that node
*/
TreeNode root = new TreeNode();
root.Text = ParentNode[loop, 1];
root.PopulateOnDemand = false;
root.SelectAction = TreeNodeSelectAction.SelectExpand;

//root.Target = "_self";

/*
* Give the url of your page
*/
root.NavigateUrl = "Default.aspx?id=" + ParentNode[loop, 0];

myReader.Close();

/*
* Now that we have [ParentId] in our array we can find out child modules
*/
OleDbCommand Module_SqlCmd = new OleDbCommand("Select * from CATEGORIES where ParentCategoryID =" + ParentNode[loop, 0], connection);

OleDbDataReader Module_Sdr = Module_SqlCmd.ExecuteReader();

while (Module_Sdr.Read())
{
// Add children module to the root node

TreeNode child = new TreeNode();

child.Text = Module_Sdr.GetValue(Module_Sdr.GetOrdinal("CategoryName")).ToString();

child.Target = "_blank";

child.NavigateUrl = "your_page_Url.aspx";

root.ChildNodes.Add(child);
}

Module_Sdr.Close();

// Add root node to TreeView
TreeView1.Nodes.Add(root);

}

/*
* By Default, when you populate TreeView Control programmatically, it expends all nodes.
*/
TreeView1.CollapseAll();
connection.Close();

}

protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
TreeView1.CollapseAll();
ExpandNodes(TreeView1.SelectedNode.ValuePath);
}

private void ExpandNodes(string valuepath)
{
string[] tmp = valuepath.Split('/');
string tmpValuePath = string.Empty;
foreach (string s in tmp)
{
tmpValuePath += s;
TreeView1.FindNode(tmpValuePath).Expand();
tmpValuePath += "/";

}
}
}

Kind regards,

simsen :-)