Seperating two numbers.

Use String.Split().

As an example, if you called this on "51.103 1.800" :

string data = "51.103 1.800";
string[] lines = data.Split();

Now lines would have 2 items, lines[0] would be "51.103" and lines[1] would be "1.800".

*Update*
----------
[Thanks to John]

Note how I don't pass any parameter to Split. What happens is that it will split based on any white space character (tab, space, multiple spaces, newline etc.)

If you specifically want to split on a single space, do it as follows:

data.Split(' ');

*Another Update *
--------------------
[Thanks to GenJerDan]

If you want to be sure that the returned array won't have any empty strings, you can use an overload that takes a StringSplitOptions argument.

Example:

string[] lines = data.Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries);

You cannot take advantage of the params feature in this overload so you need to use actual array creation syntax for the first parameter.