How to validate the radio button in form

Hi @ramrs: welcome to Uipath forum .
Could you please clarify if you are referring to forms (Forms Activities - Now in Public Preview!)

If yes , Please assign the propertyname in forms for the radio button to a string variable . For example you have a radio button as New patient as below

  1. And the property name is set as newPatient as below

  2. Assign the property name to a string variable in uipath workflow with the argument as in/out

  1. Assign the value of the radio buttons in forms display page , in my case I have given yes and no as below:-

  1. And finally do a check with the assigned variable value as below:-