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Method failed in usercontrol

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TreeView

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TIGER asked on 02 Oct 2011, 01:33 PM

Hi,
I implemented a treeview using webservice in a web page and it worked ok. the treeview is simple as follows:



<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CategoryTreeView.aspx.cs" Inherits="iBOOKSTORE.CategoryTreeView" %>
 
<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
   
 
                <telerik:RadTreeView ID="tvClass" runat="server" Height="400px" Width="500px"
                      Skin="Windows7" CheckBoxes="True" CheckChildNodes="True">
                    <WebServiceSettings Path="CategoryTreeView.aspx" Method="GetClassItems" />
                </telerik:RadTreeView>
     
    </div>
    </form>
</body>
</html>

the webmethod "GetClassItems" worked fine.
but when I convert it into a usercontrol like the following:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="UserTreeView.ascx.cs" Inherits="iBOOKSTORE.UserTreeView" %>

<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>

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

<div>

<telerik:RadTreeView ID="tvClass" runat="server" Height="400px" Width="500px"

Skin="Windows7" CheckBoxes="True" CheckChildNodes="True">

<WebServiceSettings Path="UserTreeView.ascx" Method="GetClassItems" />

</telerik:RadTreeView>

</div>

there is no difference between server side Methods. And I drag this usercontrol "UserTreeView.ascx" and drop it on a web page at the same directory. The treeview loaded ok by calling a server side function which returned a datatable. but when I click open a node, an error message popped up "GetClassItems Failed". I tried to set a break point in the WebMethod "GetClassItems", the execution never got inside. I suppose this must have something to do with the Path property. I purposely place the host page and usercontrol in the same directory, but no matter what I tried the same error occured. could you provide some advice please.
Thank you.
I send the server side code as well

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Web.Services;

using Telerik.Web.UI;

using System.Web.UI.HtmlControls;

namespace iBOOKSTORE

{

public partial class UserTreeView : System.Web.UI.UserControl

{

static DataTech.AspNet.Data.dtAspNetDataSource ds = null;

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

ds = new DataTech.AspNet.Data.dtAspNetDataSource();

LoadRootNodes(tvClass, TreeNodeExpandMode.WebService);

}

private static void LoadRootNodes(RadTreeView treeView, TreeNodeExpandMode expandMode)

{

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "SELECT DPTCODE,DPTNAME FROM DEPARTMENT WHERE LEFT(DPTCODE,1) <>'-' ORDER BY DPTCODE ";

cmd.CommandTimeout = 0;

DataTable data = GetData(cmd);

foreach (DataRow row in data.Rows)

{

RadTreeNode node = new RadTreeNode();

node.Text = row["DPTNAME"].ToString();

node.Value = row["DPTCODE"].ToString();

node.ExpandMode = expandMode;

treeView.Nodes.Add(node);

}

private static DataTable GetData(SqlCommand sqlcmd)

{

return (ds.GetDataRows(sqlcmd, "", "", 0, int.MaxValue));

}

private static DataTable GetChildNodes(string parentId)

{

SqlCommand cmd = new SqlCommand();

cmd.CommandType = CommandType.Text;

cmd.CommandText = "SELECT SUBSTRING(pc1.CLSCODE,1," + (parentId.Trim().Length + 1).ToString() + ") AS PCODE,pc1.PCODE,pc1.CLSCODE,pc1.CLSNAME,ISNULL(pc2.ChildrenCount, 0) as ChildrenCount FROM CLASS AS pc1 " +

" LEFT JOIN ( SELECT PCODE, COUNT(*) AS ChildrenCount FROM CLASS GROUP BY PCODE) AS pc2" +

" ON SUBSTRING(pc1.CLSCODE,1," + (parentId.Trim().Length + 1).ToString() + ")=pc2.PCODE WHERE pc1.PCODE='" + parentId.Trim() + "'";

cmd.CommandTimeout = 0;

return GetData(cmd);

}

private void UpdateLoadingStatusPosition(TreeViewLoadingStatusPosition statusPosition)

{

tvClass.LoadingStatusPosition = statusPosition;

}

[WebMethod]

public static RadTreeNodeData[] GetClassItems(RadTreeNodeData node)

{

DataTable data = GetChildNodes(node.Value);

List<RadTreeNodeData> result = new List<RadTreeNodeData>();

foreach (DataRow row in data.Rows)

{

RadTreeNodeData childNode = new RadTreeNodeData();

childNode.Text = row["CLSNAME"].ToString();

childNode.Value = row["PCODE"].ToString();

if (Convert.ToInt32(row["ChildrenCount"]) > 0)

{

childNode.ExpandMode = TreeNodeExpandMode.WebService;

}

result.Add(childNode);

}

return result.ToArray();

}

Method failed in usercontrol

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