C#修改IIS站点framework版本号的方法

//创建一个虚拟目录 
DirectoryEntry dirRoot = new DirectoryEntry("IIS://localhost/W3SVC/1/Root"); 
DirectoryEntries dirs = dirRoot.Children; 
DirectoryEntry virtualDir = dirs.Add("VirtualChange", dirRoot.SchemaClassName); 
object[] objs = new object[] { true }; 
virtualDir.Invoke("AppCreate", objs); 
virtualDir.Properties["AppFriendlyName"][0] = "VirtualChange"; 
virtualDir.Properties["Path"].Value = "C:\\VirtualChange"; 
virtualDir.CommitChanges(); 
//启动aspnet_iis.exe程序 
string fileName = Environment.GetEnvironmentVariable("windir") + @"\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe"; 
ProcessStartInfo startInfo = new ProcessStartInfo(fileName); 
//处理目录路径 
string path = virtualDir.Path.ToUpper(); 
int index = path.IndexOf("W3SVC"); 
path = path.Remove(0, index); 
//启动aspnet_iis.exe程序,刷新教本映射 
startInfo.Arguments = "-s " + path; 
startInfo.WindowStyle = ProcessWindowStyle.Hidden; 
startInfo.UseShellExecute = false; 
startInfo.CreateNoWindow = true; 
startInfo.RedirectStandardOutput = true; 
startInfo.RedirectStandardError = true; 
Process process = new Process(); 
process.StartInfo = startInfo; 
process.Start(); 
process.WaitForExit(); 
string errors = process.StandardError.ReadToEnd(); 
if (errors != string.Empty) 
  throw new Exception(errors); 
Console.WriteLine(process.StandardOutput.ReadToEnd());