Generate Runtime Xml / File When Opens Gives The Error Page Cannot Be Displayed?

i have genarated a xml file through the asp.net code as

public bool createxml()
{
DataSet ds = new DataSet();
clsRegister obj = new clsRegister();
int i = 0;
string strpath = string.Empty;
XmlTextWriter objwriter = new XmlTextWriter(Console.Out);
ds = obj.searchgallery(4);
try
{
strpath = "d:\hellojhasi\glance\jhansigallery\gallery.xml";
objwriter = new XmlTextWriter(strpath, System.Text.Encoding.Default);
if (ds.Tables[0].Rows.Count > 0)
{
for (i = 0; i < ds.Tables[0].Rows.Count; i++)
{
objwriter.WriteStartElement("picturegallery");
objwriter.WriteElementString("fullimage", ds.Tables[0].Rows[i]["fullimage"].ToString());
objwriter.WriteElementString("thumbnail", ds.Tables[0].Rows[i]["thumbnail"].ToString());
objwriter.WriteElementString("title", ds.Tables[0].Rows[i]["title"].ToString());
objwriter.WriteElementString("description", ds.Tables[0].Rows[i]["description"].ToString());
objwriter.WriteElementString("height", ds.Tables[0].Rows[i]["height"].ToString());
objwriter.WriteElementString("width", ds.Tables[0].Rows[i]["width"].ToString());
objwriter.WriteEndElement();
}
}
else
{
objwriter.WriteEndElement();
}
objwriter.Flush();
}
catch (Exception e)
{
}
return true;
}

the code executed well.but the xml file when opens gives the following error

The XML page cannot be displayed Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

Only one top level element is allowed in an XML document. Error processing resource 'file:///D:/HelloJhasi/glance/jhansigal...