Revoke Access To Entity

private bool RevokeAccessToEntity(ICrmService service, Guid guidValue, Guid entityID, string EntityName)
{
bool isSuccess = false;
// Create the SecurityPrincipal object.
SecurityPrincipal principal = new SecurityPrincipal();

// PrincipalId is the GUID of the team whose access is being revoked.
principal.Type = SecurityPrincipalType.Team;

principal.PrincipalId = guidValue;

// Create the target for the request.
TargetOwnedDynamic target = new TargetOwnedDynamic();
// EntityId is the GUID of the Opportunity to which
// access is being revoked.
target.EntityId = entityID;
target.EntityName = EntityName;

// Create the request object.
RevokeAccessRequest revoke = new RevokeAccessRequest();
// Set the properties of the request object.
revoke.Revokee = principal;
revoke.Target = target;
// Execute the request.

try
{
RevokeAccessResponse revoked = (RevokeAccessResponse)service.Execute(revoke);
isSuccess = true;
}
catch (Exception ex)
{
isSuccess = false;
throw ex;
}
return isSuccess;

}