string programpath = new System.Uri( System.Reflection.Assembly.GetExecutingAssembly( ).CodeBase ).LocalPath;
// Or for Windows Forms:
// string programpath = System.Windows.Forms.Application.ExecutablePath;
string[] arguments = System.Environment.GetCommandLineArgs( ).Skip( 1 ).ToArray( ); // 需要引用 Linq
System.Diagnostics.ProcessStartInfo startinfo = new System.Diagnostics.ProcessStartInfo( );
startinfo.FileName = programpath;
startinfo.UseShellExecute = true;
startinfo.Arguments = string.Join( " ", arguments );
System.Diagnostics.Process.Start( startinfo );
System.Environment.Exit( 0 ); // 退出代码0 或者其他值

// 如果是Windows窗体：
// System.Windows.Forms.Application.Exit( );