Use the [System.String.Split](<https://msdn.microsoft.com/en-us/library/system.string.split(v=vs.110).aspx>) method to return a string array that contains substrings of the original string, split based on a specified delimiter:

string sentence = "One Two Three Four";
string[] stringArray = sentence.Split(' ');

foreach (string word in stringArray)
{
    Console.WriteLine(word);    
}

Output:

One Two Three Four