I am trying to add a nodes to EO.Web.Treeview control. However nodes are getting added but they are not displayed in treeview control. I am querying the database and creating nodes based on the data returned. I am using the "Topgroup" and their "SubGroup" to add nodes. It is getting added but not displayed in Treeview. Following is the code, I am using to a node in Treeview.

string prevClientID = ClientEngSearch.ClientEngList[intClientCount].ClientID;
currTreeNode = new EO.Web.TreeNode(prevClientID + " - " + ClientEngSearch.ClientEngList[intClientCount].ClientName);
//
currTreeNode.Text = prevClientID + " - " + ClientEngSearch.ClientEngList[intClientCount].ClientName;
if (currClientID != prevClientID)
{
currTreeNode.ShowCheckBox = EO.Web.NullableBool.True;
currTreeNode.Visible = true;
trwLeft.TopGroup.Nodes.Add(currTreeNode);
treeNodeAdded = true;
// currTreeNode.PopulateOnDemand = true;
}

Thanks for your reply. I am not adding the nodes in "ItemPopulate" event. I am adding nodes on click of server side button (<asp:button>). I am using a Master page and content page concept. When this event gets fired, page_load event of master page also get executed. I am writting the code of adding nodes in content page.

I am sending Master and Content page code. Nodes are getting added in content page.

//=======================Content Page Code - Start ====================
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Threading;
using PDR.Messages;
using PDR.Site;


public partial class WIPdescr : Page
{
public PdrReports objMasterPage;
public MessageBroker messageBroker = null;
public string GPN = "";
protected void Page_Init(object sender, EventArgs e)
{
lblName_search_text.Text = "Enter a Client Name to Search for";
}
protected void Page_Load(object sender, EventArgs e)
{
GetAccessMessage msg = new GetAccessMessage();
//msg = Master.CurrentUser;

objMasterPage = (PdrReports)Page.Master;
// **********Commented this line to skip LDAP Authentication, to get rid of using

account for HPT. Once new account is created,
// uncomment following code

//msg = objMasterPage.AuthenticateUser();
//objMasterPage._GPN = msg.APPUserID;
//objMasterPage._UserName = msg.FullName;

// ****************************End of getting rid of using account got HPT. We need to

uncomment above code, once new account for PDR is created

objMasterPage._GPN = "US011694773";
objMasterPage._UserName = "Ashok Dev";
this.btnSearch.Attributes.Add("Onclick", "checkThis");

this.GPN = objMasterPage._GPN;
}

protected void Moveto_Right(object sender, EventArgs e)
{
int iIndex = 0;
int jIndex = 0;
if (chkAll.Checked)
{
trwRight.TopGroup.Nodes.Clear();
for(iIndex=0; iIndex<trwLeft.TopGroup.Nodes.Count;iIndex++)
{
trwRight.TopGroup.Nodes.Add(trwLeft.TopGroup.Nodes[iIndex].Text); // Add

Parent Node

for (jIndex = 0; jIndex < trwLeft.TopGroup.Nodes[iIndex].ChildNodes.Count;

jIndex++)
{


trwRight.TopGroup.Nodes[iIndex].ChildNodes.Add(trwLeft.TopGroup.Nodes[iIndex].ChildNodes[jInde

x].Text); // Here add Child Node.
if (trwLeft.TopGroup.Nodes[iIndex].ChildNodes[jIndex].Checked)
trwRight.TopGroup.Nodes[iIndex].ChildNodes[jIndex].Checked = true;
}
}
return;
}

foreach (EO.Web.TreeNode node in trwLeft.TopGroup.Nodes)
{
Boolean bIn = false;
foreach (EO.Web.TreeNode nd in node.SubGroup.Nodes)
{
if (nd.Checked) bIn = true;
}

if (node.Checked || bIn) {

Boolean bInTree2Top = false;

foreach (EO.Web.TreeNode node2 in trwRight.TopGroup.Nodes)
{
if (node2.Text == node.Text)
{
bInTree2Top = true;

foreach (EO.Web.TreeNode nd in node.SubGroup.Nodes)
{
if (nd.Checked)
{
nd.Checked = false;
Boolean bInTree2Sub = false;

foreach (EO.Web.TreeNode nd2 in node2.SubGroup.Nodes)
{
if (nd2.Text == nd.Text)
bInTree2Sub = true;
}
if (!bInTree2Sub) node2.ChildNodes.Add(nd.Text);


}
}
}
}
if (!bInTree2Top)
{
EO.Web.TreeNode parentNode2 = trwRight.TopGroup.Nodes.Add(node.Text);

foreach (EO.Web.TreeNode nd in node.SubGroup.Nodes)
{
if (nd.Checked)
{
nd.Checked = false;
parentNode2.ChildNodes.Add(nd.Text);
}
}
}
}
}
}

protected void Moveto_Left(object sender, EventArgs e)
{
if (chkAll.Checked && trwRight.TopGroup.Nodes.Count > 0)
{
string script = "<script type='text/javascript'>var result= confirm('You have

selected all items. Do you want to continute?');</script>";

Page.RegisterClientScriptBlock("confirm", script);

//chkAll.Checked = false;
//trwRight.Nodes.Clear();
// Here is the code to move entire left to right.

int iIndex = 0;
int jIndex = 0;
EO.Web.TreeNode trNode;
if (chkAll.Checked)
{
trwLeft.TopGroup.Nodes.Clear();
for (iIndex = 0; iIndex < trwRight.TopGroup.Nodes.Count; iIndex++)
{


trwLeft.TopGroup.Nodes.Add((EO.Web.TreeNode)trwRight.TopGroup.Nodes[iIndex]); // Add Parent

Node

for (jIndex = 0; jIndex <

trwRight.TopGroup.Nodes[iIndex].ChildNodes.Count; jIndex++)
{
trNode = trwRight.TopGroup.Nodes[iIndex].ChildNodes[jIndex];
trwLeft.TopGroup.Nodes[iIndex].ChildNodes.Add((EO.Web.TreeNode)

trNode); // Here add Child Node.
if (trwRight.TopGroup.Nodes[iIndex].ChildNodes[jIndex].Checked)
trwLeft.TopGroup.Nodes[iIndex].ChildNodes[jIndex].Checked = true;
}
}

chkAll.Checked = false;
trwRight.Nodes.Clear();

return;
}

}
else
{
for (int i = 0; i < trwRight.TopGroup.Nodes.Count; i++)
{
EO.Web.TreeNode node = trwRight.TopGroup.Nodes[i];
if (node.Checked)
trwRight.Nodes.Remove(node);
else
{
for (int j = 0; j < node.ChildNodes.Count; j++)
{
if (node.ChildNodes[j].Checked)
node.SubGroup.Nodes.Remove(node.ChildNodes[j]);
}
}
}
}
}
protected void chkAll_Click(object sender, EventArgs e)
{

}


protected void search_Changed(object sender, EventArgs e)
{
System.Web.UI.WebControls.RadioButton radioSender =

(System.Web.UI.WebControls.RadioButton)sender;
lblName_search_text.Text = "Enter a " +

radioSender.Text.Substring(0,(radioSender.Text.Length-1)) + " to Search for";

}

protected void date_Changed(object sender, EventArgs e)
{

}
protected void btnSearch_Click(object sender, EventArgs e)
{
string SearchItem = "";
string currClientID = "";
string prevClientID = "";
string currEngData = "";
bool treeNodeAdded = false;
EO.Web.TreeNode currTreeNode;

// Here write a query to search an item.
ClientEngSearchMessage ClientEngSearch = new ClientEngSearchMessage();
if (Request["selBusinessUnits"] == "1") // All business units
ClientEngSearch.BusinessUnit = Request["hidAllBusinessUnits"];
else
ClientEngSearch.BusinessUnit = "'" + Request["selBusinessUnits"] + "'";

ClientEngSearch.EmplID = "US011047778";//this.GPN;
ClientEngSearch.RoleCode = Request["hidRoleCodes"];
ClientEngSearch.OUList = Request["hidOuCodes"];
ClientEngSearch.MUList = Request["hidMuCodes"];
ClientEngSearch.SMUList = Request["hidSMUCodes"];
ClientEngSearch.EngType = Request["selEngType"];
ClientEngSearch.EngClass = Request["selEngClass"];
ClientEngSearch.Relieved = Request["selRelHours"];

if (Request["selRoleFilter"] == "0")
ClientEngSearch.ClientEngRole = false;
else
ClientEngSearch.ClientEngRole = true;

// Here Set the parameter depending on User Selection.

SearchItem = this.txtNameSearch.Text;

if (this.radClientID.Checked)
ClientEngSearch.ClientID = SearchItem;
else if (this.radClientName.Checked)
ClientEngSearch.ClientName = SearchItem;
else if (this.radEngID.Checked)
ClientEngSearch.EngID = SearchItem;
else if (this.radEngName.Checked)
ClientEngSearch.EngName = SearchItem;

// Now call the DataAction:

objMasterPage.messageBroker.Invoke("GetClientEngData", ref ClientEngSearch);

if (null != ClientEngSearch.ClientEngList)
{
trwLeft.Nodes.Clear();

for (int intClientCount = 0; intClientCount <=

ClientEngSearch.ClientEngList.Length - 1; intClientCount++)
{

prevClientID = ClientEngSearch.ClientEngList[intClientCount].ClientID;
currTreeNode = new EO.Web.TreeNode(prevClientID + " - " +

ClientEngSearch.ClientEngList[intClientCount].ClientName);
//
currTreeNode.Text = prevClientID + " - " +

ClientEngSearch.ClientEngList[intClientCount].ClientName;
if (currClientID != prevClientID)
{
currTreeNode.ShowCheckBox = EO.Web.NullableBool.True;
currTreeNode.Visible = true;
trwLeft.TopGroup.Nodes.Add(currTreeNode);
treeNodeAdded = true;
currTreeNode.Visible = true;
}

if (treeNodeAdded)
{
for (int intEngCount = 0; intEngCount <=

ClientEngSearch.ClientEngList.Length - 1; intEngCount++)
{
currClientID = ClientEngSearch.ClientEngList[intEngCount].ClientID;
if (prevClientID == currClientID)
{
currEngData = ClientEngSearch.ClientEngList[intEngCount].EngID + "

- " + ClientEngSearch.ClientEngList[intEngCount].EngName;
currTreeNode = new EO.Web.TreeNode(currEngData);
currTreeNode.Text = currEngData;
currTreeNode.ShowCheckBox = EO.Web.NullableBool.True;


trwLeft.TopGroup.Nodes[intClientCount].SubGroup.Nodes.Add(currTreeNode);
currTreeNode.Visible = true;
}
}
treeNodeAdded = false;
}


}

}

}
protected void chkAll_CheckedChanged(object sender, EventArgs e)
{

}
}

====================Content Page Code - End=========================

====================Master Page Code - Start=========================
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 EY.ADAuth;
using EY.GFIS.Core;
using EY.GFIS.Core.Messages;
using PDR.Site;
using PDR.Messages;
using System.Security.Principal;

public partial class PdrReports : System.Web.UI.MasterPage
{
public MessageBroker messageBroker = null;
public GetAccessMessage CurrentUser = null;
public double SessionTimeout = 20;
public string strTimeOutExpired = "";
public string _UserName = "";
public string _GPN = "";
public string UserEngManCountry = "";
public string UserPerManCountry = "";
public string SelectedManCountry = "";
public string SelectedReportID = "";

public PdrReports()
{
this.Load += new EventHandler(PdrReports_Load);
//this.cboReports.SelectedIndexChanged += new EventHandler(cboReports_SelectedIndexChanged);
}




public void PdrReports_Load(object sender, EventArgs e)
{
string userHistoryReportId = "";
string strTempEngManCountry = "";
string strTempPerManCountry = "";
string strPrevReportID = "";

EY.GFIS.Core.Caching.ICacheWrapper cw = new EY.GFIS.Core.Caching.ASPCacheWrapper(this.Cache);
messageBroker = new MessageBroker(cw);

// Get Previously selected Report ID:
strPrevReportID = Request["reportID"]; //this.cboReports.Items[this.cboReports.SelectedIndex].Value;

// Get the Engagement Managerial Country
if (null != Request["EngManCountry"] && null != Request["PerManCountry"])
{
strTempEngManCountry = Request["EngManCountry"].ToString();
strTempPerManCountry = Request["PerManCountry"].ToString();
}
else
{
strTempEngManCountry = Request["SelectedEngManCountry"].ToString();
strTempPerManCountry = Request["SelectedEngManCountry"].ToString();
}
if (UserEngManCountry == null || UserEngManCountry.Trim() == "")
UserEngManCountry = strTempEngManCountry.Substring(strTempEngManCountry.Length-4,4);

// Get the Personal Managerial Country

if (UserPerManCountry == null || UserPerManCountry.Trim() == "")
UserPerManCountry = strTempPerManCountry.Substring(strTempPerManCountry.Length-4,4) ;

GetRptUserMessage UserRPTMessage = new GetRptUserMessage();

UserRPTMessage.AppUserID = _GPN;
UserRPTMessage.EngManCountry = UserEngManCountry.Trim();
UserRPTMessage.PerManCountry = UserPerManCountry.Trim();

this.messageBroker.Invoke("GetUserHistoryReports", ref UserRPTMessage);

if(null != UserRPTMessage.UserReportHistoryArray)
if(UserRPTMessage.UserReportHistoryArray.Length>0)
userHistoryReportId = UserRPTMessage.UserReportHistoryArray[UserRPTMessage.UserReportHistoryArray.Length-1].ToString() ;

this.messageBroker.Invoke("GetUserAccessReports", ref UserRPTMessage);

if (!IsPostBack) // To check if populating a dropdown for first time.
{
this.cboReports.Items.Clear();

if (null != UserRPTMessage.UserReportsAccessListArray && UserRPTMessage.UserReportsAccessListArray.Length > 1)
{
for (int intRepListCount = 0; intRepListCount <= UserRPTMessage.UserReportsAccessListArray.Length - 1; intRepListCount++)
{
//this.cboReports.Items.Add(UserRPTMessage.UserReportsAccessListArray[intRepListCount].ReportDesc);

this.cboReports.Items.Add(new ListItem(UserRPTMessage.UserReportsAccessListArray[intRepListCount].ReportDesc, UserRPTMessage.UserReportsAccessListArray[intRepListCount].ReportID));
if (strPrevReportID == UserRPTMessage.UserReportsAccessListArray[intRepListCount].ReportID)
this.cboReports.Items[intRepListCount].Selected = true;
}
// Store default Report ID:
//this.SelectedReportID = this.cboReports.Items[0].Value;
}
}
else
{
for (int intRepListCount = 0; intRepListCount <= cboReports.Items.Count - 1; intRepListCount++)
{
//this.cboReports.Items.Add(UserRPTMessage.UserReportsAccessListArray[intRepListCount].ReportDesc);

if (strPrevReportID == cboReports.Items[intRepListCount].Value)
this.cboReports.Items[intRepListCount].Selected = true;
}
//this.SelectedReportID = this.cboReports.Items[cboReports.SelectedIndex].Value;
}
this.SelectedReportID = this.cboReports.Items[cboReports.SelectedIndex].Value;


// Now populate the Managerial countries

GetClientManCountryMessage msgClientManCountries = new GetClientManCountryMessage();

// Here get the data for Managerial Country and Person Managerial Country.
msgClientManCountries.appUserID = _GPN;

this.messageBroker.Invoke("GetPDRClientManCountry", ref msgClientManCountries);

if (!IsPostBack)
{
cboManCountry.Items.Clear(); // Clear all existing items

for (int intClientManCountry = 0; intClientManCountry < msgClientManCountries.PDRClientManCountry.Length; intClientManCountry++)
{
if (msgClientManCountries.PDRClientManCountry[intClientManCountry].MCFlag == "E")
{
// Here Populate Client Man Country:
//cboManCountry.Items.Add( new ListItem(msgClientManCountries.PDRClientManCountry[intClientManCountry].Description + " - " + msgClientManCountries.PDRClientManCountry[intClientManCountry].ManCountry),);
this.cboManCountry.Items.Add(new ListItem(msgClientManCountries.PDRClientManCountry[intClientManCountry].Description + " - " + msgClientManCountries.PDRClientManCountry[intClientManCountry].ManCountry, msgClientManCountries.PDRClientManCountry[intClientManCountry].ManCountry));
if (strTempEngManCountry == msgClientManCountries.PDRClientManCountry[intClientManCountry].ManCountry)
this.cboManCountry.Items[this.cboManCountry.Items.Count-1].Selected = true;
}
}
// Store default Report ID:
this.SelectedManCountry = this.cboManCountry.Items[cboManCountry.SelectedIndex].Value;
}
}




public GetAccessMessage GetUserDetailsFromCookie(string cookieValue)
{
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

System.IO.MemoryStream mstream = new System.IO.MemoryStream();

byte[] serializedData = Convert.FromBase64String(cookieValue);
mstream.Write(serializedData, 0, serializedData.Length);
mstream.Seek(0, System.IO.SeekOrigin.Begin);
return bf.Deserialize(mstream) as GetAccessMessage;
}

public string GetUserDetailsStringForCookie(GetAccessMessage msg)
{
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
System.IO.MemoryStream mstream = new System.IO.MemoryStream();
bf.Serialize(mstream, msg);
return Convert.ToBase64String(mstream.ToArray());
}
protected void cboReports_SelectedIndexChanged(object sender, EventArgs e)
{
string strEngManCountry = "";
string strReportID = this.cboReports.SelectedItem.Value.ToString() ;
string strReportDesc = this.cboReports.SelectedItem.Text.ToString();

// Here populate Managerial countries now
GetClientManCountryMessage UserManCountriesPopulation = new GetClientManCountryMessage();

UserManCountriesPopulation.appUserID = this._GPN;
UserManCountriesPopulation.reportID = strReportID;
UserManCountriesPopulation.reportDesc = strReportDesc;


this.SelectedReportID = strReportID; // Get the selected Report ID.
this.SelectedManCountry = cboManCountry.SelectedValue.Substring(cboManCountry.SelectedValue.Length-4,4); // Get the selected Man Country.

this.messageBroker.Invoke("PopulateClientEngCountries", ref UserManCountriesPopulation);

strEngManCountry = cboManCountry.SelectedValue;

cboManCountry.Items.Clear(); // Clear all existing items

for (int intClientManCountry = 0; intClientManCountry < UserManCountriesPopulation.PDRClientManCountry.Length; intClientManCountry++)
cboManCountry.Items.Add(UserManCountriesPopulation.PDRClientManCountry[intClientManCountry].Description + " - " + UserManCountriesPopulation.PDRClientManCountry[intClientManCountry].ManCountry);

// Do a response.redirect here to redirect a user to corresponding page:

strReportDesc = strReportDesc.ToUpper(); // Convert everything to Upper case

switch (strReportDesc)
{
case "INVOICE DETAILS":

break;
case "INVOICE HISTORY":
break;
case "UTILIZATION":
break;
case "WIP - INPUT DESCRIPTION":
Response.Redirect("WIPDescription.aspx?SelectedEngManCountry=" + this.SelectedManCountry + "&SelectedPerManCountry=" + this.SelectedManCountry + "&reportID=" + strReportID); //
break;
case "INTER-FIRM BILLING":
Response.Redirect("InterFirm.aspx?SelectedEngManCountry=" + this.SelectedManCountry + "&SelectedPerManCountry=" + this.SelectedManCountry + "&reportID=" + strReportID); //
break;
default:
break;
}
}
protected void cboManCountry_SelectedIndexChanged(object sender, EventArgs e)
{
string strManCountry = "";
string strReportDesc = "";
string strReportID = "";
GetRptUserMessage UserReportPopulation = new GetRptUserMessage();

strManCountry = this.cboManCountry.SelectedValue;

//this.SelectedReportID = this.cboReports.SelectedValue; // Get the selected Report ID.
this.SelectedManCountry = strManCountry.Substring(strManCountry.Length - 4, 4); // Get the selected Man Country.

UserReportPopulation.AppUserID = _GPN;
UserReportPopulation.EngManCountry = strManCountry.Substring(strManCountry.Length - 4, 4);
UserReportPopulation.PerManCountry = strManCountry.Substring(strManCountry.Length - 4, 4);

this.messageBroker.Invoke("GetUserAccessReports", ref UserReportPopulation);

this.cboReports.Items.Clear();

for (int intRepListCount = 0; intRepListCount <= UserReportPopulation.UserReportsAccessListArray.Length - 1; intRepListCount++)
this.cboReports.Items.Add(new ListItem(UserReportPopulation.UserReportsAccessListArray[intRepListCount].ReportDesc, UserReportPopulation.UserReportsAccessListArray[intRepListCount].ReportID));

strReportDesc = this.cboReports.Items[0].Text; // Convert everything to Upper case

strReportDesc = strReportDesc.ToUpper();
strReportID = this.cboReports.Items[0].Value;
this.SelectedReportID = strReportID;

switch (strReportDesc)
{
case "INVOICE DETAILS":

break;
case "INVOICE HISTORY":
break;
case "UTILIZATION":
break;
case "WIP - INPUT DESCRIPTION":
Response.Redirect("WIPDescription.aspx?SelectedEngManCountry=" + this.SelectedManCountry + "&SelectedPerManCountry=" + this.SelectedManCountry + "&reportID=" + strReportID); //
break;
case "INTER-FIRM BILLING":
Response.Redirect("InterFirm.aspx?SelectedEngManCountry=" + this.SelectedManCountry + "&SelectedPerManCountry=" + this.SelectedManCountry + "&reportID=" + strReportID); //
break;
default:
break;
}
}
}

==================================Master Page Code - End==============