Q:

remove first line from text file and put rest of words into an array that separated from white-spaces,

I have text file in a following format 

432
23 34 45 56 78 90
67 87 90 76 43 09
.................

I want to remove first line and insert rest of the words into an array that separated from white space.
I wrote following code to get words by removing white spaces
    StreamReader streamReader = new StreamReader("C:\\Users\\sample.txt"); //get the file
    string stringWithMultipleSpaces = streamReader.ReadToEnd(); //load file to string
    streamReader.Close();

    Regex newrow = new Regex(" +"); //specify delimiter (spaces)
    string[] splitwords = r.Split(stringWithMultipleSpaces); //(convert string to array of words)

once I put a debug point on string[] splitwords line i can see following out put

How can I remove first line and get rest of the words from array index [0] ?

A:

You need to split with all whitespaces, not just a plain space.
Use @"\s+" pattern to match 1+ whitespace symbol(s):
string[] splitwords = Regex.Split(stringWithMultipleSpaces, @"\s+");

Another approach is reading the file line by line, and - if there are always only numbers like those and no Unicode spaces present - use plain String.Split().
Something like
var results = new List<string>();
using (var sr = new StreamReader("C:\\Users\\sample.txt", true))
{
    var s  = string.Empty;
    while ((s=sr.ReadLine()) != null)
    {
        results.AddRange(s.Split());
    }
}

