Finding Button within Button Group Class Using Selenium Webdriver in C# -

my end goal able click yes or no on webpage.

using fire bug can see yes , no buttons reside in class called "btn-group"

<div class="btn-group btn-group-default answer-toggle" aria-label="..." role="group">      <button class="btn ng-pristine ng-valid active btn-secondary ng-touched" btn-radio="true" ng-model="consultation.previoussoundvoid" ng-class="{'btn-secondary': consultation.previoussoundvoid}" type="button">           yes      </button>      <button class="btn ng-pristine ng-untouched ng-valid" btn-radio="false" ng-model="consultation.previoussoundvoid" ng-class="{'btn-secondary': consultation.previoussoundvoid == false}" type="button">           no      </button> </div> 

i think find element xpath trying improve selenium skill.

i hoping there way first find "btn-group" class somehow choose yes or no within that.

or able create variables both yes , no options. if do:

var button = driver.instance.findelements(by.classname("btn")); 

it returns 21 options. found that:

button[15].text     returns "yes" button[16].text     returns "no" 

instead of having through 21 results , worrying if index changes, can search results text somehow?

the best way identify element using text , xpath since not have unique id

//button[.='yes'] 

desperate use cssselector?

.btn.ng-pristine.ng-valid.active.btn-secondary.ng-touched 

since compound class

you can go nth-child() css

[role='group']>button:nth-child(1) 

whereas 2 let select button text no