title: CspParameter check if a keycontainername already exists
body: <p>I've successfully signed my XML files using the RSACryptoServiceProvider. My key is stored in the Machine Key Store.</p>
  
  <p>Now, I would like to check if the machinekeystore already contains the key that is related with the keycontainername or if the rsacryptoserviceprovider will need to create a new one.</p>
  
  <p>How may I accomplish this?</p>
  
  <p>Appreciate for your help!
  Camille.</p>