How to get OptionSet value inside a plugin

 OptionSetValue oValue = (OptionSetValue)entity.Attributes["new_myentity"];
                        int optionSetValue = oValue.Value;
 var pOptionMetadata = optionList.Where(c => c.Value == optionSetValue).FirstOrDefault();
 string myOptionSetText=pOptionMetadata .Label.LocalizedLabels[0].Label

    public OptionMetadata[] GetOptionMetadata(string logicalEntityName, string optionSetAttributeName, IOrganizationService service)
        {
            RetrieveAttributeRequest retrieveAttributeRequest =
                                         new RetrieveAttributeRequest
                                         {
                                             EntityLogicalName = logicalEntityName,
                                             LogicalName = optionSetAttributeName,
                                             RetrieveAsIfPublished = true
                                         };

            // Execute the request.
            RetrieveAttributeResponse retrieveAttributeResponse =
                (RetrieveAttributeResponse)service.Execute(
                retrieveAttributeRequest);

            // Access the retrieved attribute.
            PicklistAttributeMetadata retrievedPicklistAttributeMetadata =
                (PicklistAttributeMetadata)
                retrieveAttributeResponse.AttributeMetadata;

            // Get the current options list for the retrieved attribute.
            OptionMetadata[] optionList =
                retrievedPicklistAttributeMetadata.OptionSet.Options.ToArray();

            return optionList;
        }