Select Random Item from a 2D (2 Dimensional) Array using C# .Net

This way

string[,] GeoLocation = new string[,]{
                {"-0.174464","51.542180"},
                {"-0.172925","51.548507"},
                {"-0.178464","51.556919"},
                {"-0.178487","51.556902"}
                };
int index = new Random().Next(0, GeoLocation.Length - 1);
string lat = GeoLocation[index, 0];
string lng = GeoLocation[index, 1];