Framework EDI Reference. Methods and Properties
ediSecurityCertificate. CspServiceProvider

Returns the name of the Cryptographic Service Provider (CSP) that is associated with the certificate's key container.

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Remarks:

When the certificate is associated with a key container, the certificate can be used to sign or decrypt because it can use the associated key container's private key.  If the value of this property is not an empty string then it indicates that the certificate has been associated with a key container.