create and set dynamic object in C#

dynamicObject.cs

 using System.Dynamic;
 
 dynamic record = new ExpandoObject();
 AddProperty(record, "property_name", "property_value");
  
  public static void AddProperty(ExpandoObject expando, string propertyName, object propertyValue)
        {
            var expandoDict = expando as IDictionary<string, object>;
            if (expandoDict.ContainsKey(propertyName))
                expandoDict[propertyName] = propertyValue;
            else
                expandoDict.Add(propertyName, propertyValue);
        }