RSA/ECB/PKCS1Padding Using C#

Question

Looking for SymmetricKeyEncrypted 32 Byte String  

   i) Encode the 32 byte (character) key  to base64 format.
   ii) Apply RSA/ECB/PKCS1Padding to encrypt the 32 byte (character) key (after base 64 encoding)

this encryption based on Public Key [pem File]