asp.net：easyui tree控件加载url数据

CREATE TABLE [dbo].[OrganizationStructure](
[Id] [int] IDENTITY(1,1) NOT NULL,
[OwnerId] [int] NOT NULL,
[Name] [nvarchar](100) NOT NULL,
[Type] [int] NULL,
CONSTRAINT [PK_OrganizationStructure] PRIMARY KEY CLUSTERED
(
[Name] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

private string GetOrganizationStructureText()
{
StringBuilder sb = new StringBuilder();
sb.Append("[");
GetChildrenText(0, ref sb);
sb.Append("]");
return sb.ToString();
}
private void GetChildrenText(int id,ref StringBuilder sb)
{
using(TrainingSystemDataContext dc=new TrainingSystemDataContext(DBConn.GetConn()))
{
var query = from s in dc.OrganizationStructure where s.OwnerId == id select s;
int querycount = query.Count();
int i = 0;
foreach (var s in query)
{
sb.AppendLine("{" + string.Format("\"id\":{0},\"text\":\"{1}\"", s.Id, s.Name));
int count = DBCommand.QueryInteger("SELECT COUNT(*) FROM [OrganizationStructure] WHERE [OwnerId]=" + s.Id);
if (count > 0)
{
sb.AppendLine(",\"children\":[");
GetChildrenText(s.Id,ref sb);
sb.AppendLine("]");
}
sb.AppendLine("}");
++i;
if (i != querycount)
sb.Append(",");
}
}
}

<ul id="tt" class="easyui-tree"
url="data.aspx">