How to use data from one class into another?

I have the following method in public abstract A : IVirtualMachineExporter :

public override void Prepare() { ... }

I call the Prepare from another class B:

public sealed class B
{
    public new ExportJobRequest Request { get { return (ExportJobRequest)base.Request; } }

     private void ExportTask()
     {
          IVirtualMachineExporter exporter = CreateExporter();
          exporter.Prepare();
     }
}

Request containing public bool isAdHoc { get; set; }. I want to use information from this property inside Prepare(). How can I do this? I don't want to change Prepare() signature.