Here is the code example:

         // 2448 is an ID of the class defining your bizform, you can find this id in the CMS_Class table, look for the row where classname is starting with BizForm
       
        DataClassInfo classInfo = DataClassInfoProvider.GetDataClass(2448);
        FormInfo formInfo = new FormInfo(classInfo.ClassFormDefinition);
        FormFieldInfo field = formInfo.GetFormField("bizformFieldCodeName");
        Hashtable hs = field.Settings;

        string pairs = hs["options"].ToString();