DataTable dt = new DataTable();
                DataSet ds = new DataSet();
                string fileName = @"izdelia.xml";
                dt = ((DataTable)dataGridView1.DataSource).Copy();
                ds.Tables.Add(dt);
                System.IO.FileStream myFileStream = new System.IO.FileStream(fileName, System.IO.FileMode.Create);
                  //System.Xml.XmlTextWriter myXmlWriter = new System.Xml.XmlTextWriter(myFileStream, System.Text.Encoding.Unicode);
                  System.Xml.XmlDataDocument  xmlDoc = new System.Xml.XmlDataDocument(ds);
                  xmlDoc.DataSet.EnforceConstraints = false;
                  System.Xml.XmlDeclaration xmlDec = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", "yes");
                  xmlDoc.PrependChild(xmlDec);
                  System.Xml.XmlWriter xmlWriter;
                  xmlWriter = new XmlTextWriter(myFileStream, System.Text.Encoding.UTF8);
                  xmlDoc.WriteTo(xmlWriter);