using static System.Console;
public class Program {
public static void Main() {
string nullString = null;
string emptyString = "";
string spaceString = " ";
string tabString = "\t";
string newlineString = "\n";
string nonEmptyString = "texto";
WriteLine(string.IsNullOrEmpty(nullString));
WriteLine(string.IsNullOrEmpty(emptyString));
WriteLine(string.IsNullOrEmpty(spaceString));
WriteLine(string.IsNullOrEmpty(tabString));
WriteLine(string.IsNullOrEmpty(newlineString));
WriteLine(string.IsNullOrEmpty(nonEmptyString));
WriteLine();
WriteLine(string.IsNullOrWhiteSpace(nullString));
WriteLine(string.IsNullOrWhiteSpace(emptyString));
WriteLine(string.IsNullOrWhiteSpace(spaceString));
WriteLine(string.IsNullOrWhiteSpace(tabString));
WriteLine(string.IsNullOrWhiteSpace(newlineString));
WriteLine(string.IsNullOrWhiteSpace(nonEmptyString));
}
}
//https://pt.stackoverflow.com/q/172694/101