how to export rsa key container in c#

I want to create a rsa key in c# and export the container. I am having difficulty. I create container like this:
CspParameters cspParams = new CspParameters();
cspParams.KeyContainerName = "XML_ENC_RSA_KEY";The msdn example says I can export the container with this syntax:
aspnet_regiis -pa "XML_ENC_RSA_KEY" "NT AUTHORITY\NETWORK SERVICE". This does not work on my XP Host PC. I belive this is applicable for Windows 2003 Server.
1) So what is the correct syntax for exporting rsa key container from XP host?

Also to get aspnet_regiis.exe path I did something like this:
string winPath = Environment.GetEnvironmentVariable("windir");
string fullPath = winPath + @"\Microsoft.NET\Framework\v2.0.50727" + @"\aspnet_regiis.exe";But this path may be different for each host, based on the .NET verison installation.
2) Is there a way to get the aspnet_regiis.exe path from registry or a environment varaible?

Once I get the path to aspnet_regiis.exe I want to invokve it from c# like this.
3) Is this code correct?
ProcessStartInfo startInfo = new ProcessStartInfo(fullPath);
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;

System.Diagnostics.Process process = new System.Diagnostics.Process();
startInfo.Arguments = args;
process.StartInfo = startInfo;
process.Start();
process.WaitForExit();Can someone please help me?