Retrieve value from array class

I have a class as below

 

public partial class Property
{
public string keyField { get; set; }

public object valueField { get; set; }

}

 

i am now creating a property like this

 

private string TrackingId { get; set; }
private string ApplicationId { get; set; } 

public Property[] Properties;

 

and assiging values like,

 

Properties = new Property[3];
Properties[0] = new Property { key = "XXX", value = TrackingId };
Properties[1] = new Property { key = "YYY", value = ApplicationId }; 

 

now i need to retrieve value from collection property dynamically, as of now i know only to retrieve static as 

 string key = request.Properties[0].key[0].ToString();
string value = (string)request.Properties[0].value;

 

 is there possibility to take dynamically by not using index value hard coded & not using for loop