private void OnResetManifest()
{
String sourceRoot = ConfigurationManager.AppSettings["source_root"];
String manifestFile = sourceRoot + "Properties\\WMAppManifest.xml";
XmlDocument doc = new XmlDocument();
doc.Load(manifestFile);
XmlNode nodeApp = doc.SelectSingleNode("//App");
this.productID = Guid.NewGuid().ToString("B");
nodeApp.Attributes["ProductID"].Value = this.productID;
nodeApp.Attributes["Title"].Value = this.txt_AppName.Text;
XmlNode nodeTitle = doc.SelectSingleNode("//Title");
nodeTitle.InnerText = this.txt_AppName.Text;
doc.Save(manifestFile);
}