C# / .NET - check if string is empty

In this article, we would like to show you how to check if string is null or empty in C#.

Quick solution:

string string1 = "";
string string2 = null;
string string3 = "ABC";

Console.WriteLine(String.IsNullOrEmpty(string1)); // True
Console.WriteLine(String.IsNullOrEmpty(string2)); // True
Console.WriteLine(String.IsNullOrEmpty(string3)); // False

Practical example

In this section, we present a full example of using IsNullOrEmpty() method to check if strings are empty.

using System;

public class Program
{
    public static void Main()
    {
        string string1 = "";
        string string2 = null;
        string string3 = "ABC";

        Console.WriteLine(String.IsNullOrEmpty(string1)); // True
        Console.WriteLine(String.IsNullOrEmpty(string2)); // True
        Console.WriteLine(String.IsNullOrEmpty(string3)); // False
    }
}

Output:

True
True
False

References

1. String.IsNullOrEmpty(String) Method (System) | Microsoft Docs