bind a gridview with the help of xml in 3 layer architecture

private void ReadxmlFromXmlTextReader(string file_Path )
    {
        DS_purchase = new DataSet(); // Create the DataSet to read the schema into.    
        FileInfo FInfo = new FileInfo(file_Path);
        if (FInfo.Exists)
        {
            System.Xml.XmlTextReader xmlReader = new System.Xml.XmlTextReader(FInfo.FullName);
            xmlReader.WhitespaceHandling = WhitespaceHandling.None;
            try
            {
                DS_purchase.ReadXml(xmlReader);
               }
            catch (Exception ex)
            {
                    
            }
            finally
            {
                xmlReader.Close();
            }

        }
        
    }