protected void btnNewRow_Click(object sender, EventArgs e)
{
           DataSet myDset = ReadXMLDataSet();
            //Check if table exist
           if (myDset != null && myDset.Tables.Count > 0)
            {
                //Copy the structue of row and fill data
                DataRow myDrow = myDset.Tables[0].NewRow();
                myDrow["name"] = "Lap To";
                myDrow["nationality"] = "US";
                myDrow["movement"] = "What";
                myDrow["birthdate"] = "Jan 1 2000";
                //Add Row to datatable
                myDset.Tables[0].Rows.Add(myDrow);
				
                //Commit the changes
                myDset.AcceptChanges();
                //Save the changes
                SaveXMLDataSet(myDset);
                PopulateGrid(); // refresh screen/gridview
            }
        }
        // read xml file
        private DataSet ReadXMLDataSet()
        {
            DataSet myFile = new DataSet();
            string xmlFilename = Server.MapPath("~/App_Data/artists.xml");
            myFile.ReadXml(xmlFilename);
            return myFile;
        }
        // save row back to xml file
        private void SaveXMLDataSet(DataSet dset)
        {
            string xmlFilename = Server.MapPath("~/App_Data/artists.xml");
            if (dset != null)
                dset.WriteXml(xmlFilename);
        }
        private void PopulateGrid()
        {
            DataSet dSet = ReadXMLDataSet();
            // quick check to make sure xml file not return empty data
            if (dSet != null && dSet.Tables.Count > 0 && dSet.Tables[0].Rows.Count > 0)
            {
                ian.DataSource = dSet;
                ian.DataBind();
            }
        }