var lines = new[]
{
     "Line A",
     "Line B",
     "Line C"
};

var query = lines.Select((line, index) =>; new
{
     Prop = string.Format("Address {0}", index),
     Value = line
});

foreach (var prop in query)
{
     Console.WriteLine("Prop: {0} - Value: {1} ",prop.Prop, prop.Value);
}