Invokes a transform function on each element of a sequence and returns the maximum nullable Double value. Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence. So, you can also select both or only "Web API". This method will use httpclient post MultipartFormDataContent (multipart/form-data) class properties and pdf file to server. Determines whether the specified object is equal to the current object. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function. IEqualityComparer