GraphQLRequest variables in c#

Question

 var getOrdersByWaveRequest1 = new GraphQLRequest
                {

                    Query ="query",
                     Variables=new {

                          input = new product()
                        }

                };

graphQLClient.SendQueryAsync<ProductResponse>(WaveRequest1)

I'm using above code to call Graphql API and I'm getting the result but everytime I'm not getting the result according to the variables I passed
Anyone can help me here