c# - Generic object for two different classes -

i have class acquisition device. want create class generates random samples when acquisition device not connected.

this object:

private object amplifierobj; 

and want create that

if (ampsettingsobj.daqdevice == "noamp")      ampobj = new noampmanager(samplerate: samplerate); else      ampobj = new usbampmanager(optcalibrationflag: calibrationflag,                          serialnumbers: serialnumbers, samplerate: samplerate); 

however, when call 1 of methods error "object" not contain definition method . both classes have same methods implemented. best way of implementing it? should use generic class placeholder?

if both classes have same methods should have interface (iamplifier) , both classes should implement interface.

this can done right clicking 1 of classes , selecting refactor / extract interface.

assuming interface name iamplifier, have both classes implement same interface such as:

public class noampmanager : iamplifier {     ... (methods)     ... (properties) }  public class usbampmanager : iamplifier {     ... (methods)     ... (properties) } 

then, instead of

private object amplifierobj; 

use

private iamplifier amplifierobj;