Get ItemSearch with standard and custom fields

Hi,
Before to start, this is my first post, im a c# programmer and i read the online documentation for start with the classes and objects in C#, thank you for let me post in this forum.

I have a question, finally i could get the items propierties but just for one record, what i hold is get all the records for example, in Netsuite i realize a Saved search, but in C# i dont know how do this.

This is my code.

public virtual void GetItem()
        {
            RecordRef item = new RecordRef();
            item.internalId = "4746";
            item.type = RecordType.inventoryItem;
            item.typeSpecified = true;