remove whitespace between string c#

string str = "This is a test";
str = str.Replace(" ", String.Empty);
// Output: Thisisatest

using System;
using System.Text.RegularExpressions;

public class Program
{
	public static void Main()
	{
		string yourString = "The value is: 99 086.78";
		string newString = "";	// MUST set the Regex result to a variable for it to take effect
		newString = Regex.Replace(yourString, @"\s+", ""); //Replaces all(+) space characters (\s) with empty("")
		Console.WriteLine(newString);
		// Output: Thevalueis:99086.78
	}
}

string str = "C Sharp";
str = Regex.Replace(str, @"\s", "");

using System.Linq;

// ...

string example = "   Hi there!    ";
string trimmed = String.Concat(example.Where(c => !Char.IsWhiteSpace(c)));
// Result: "Hithere!"

string str = "C Sharp";
str = Regex.Replace(str, @"\s", "");