C# - Asp Tree View Export To Excel?

I have a web application where I am using asp.net tree view control to show data. No I want that this tree view structure has to exported to excel. Following is the code which do this for me.

private void ExportSiteStructure()
{
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
Response.Charset = "";
this.EnableViewState = false;
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
TreeVWSite.RenderControl(oHtmlTextWriter);
if (TreeVWGroups.Nodes.Count > 0)
{
TreeVWGroups.RenderControl(oHtmlTextWriter);
}
Response.Write(oStringWriter.ToString());
Response.End();
}

It works perfect but the report what it gives me contains all parent and child node of tree view get palced in excell cell as well as icons and checkboxes which I have use. What I want is to have only Text in excel cell that represent node of tree view and not those icons and checkboxes associated with them.