double dScreenWid = System.Windows.SystemParameters.PrimaryScreenWidth;
double dScreenHei = System.Windows.SystemParameters.PrimaryScreenHeight;
this.Left = dScreenWid - 200;
this.Top = dScreenHei - 200;
System.Diagnostics.Process.Start(@"C:\Program Files\Microsoft Office\Office14\EXCEL.EXE"); //调用该命令,在程序启动时打开Excel程序