In this source code example, we will demonstrate the usage of String.IsNullOrEmpty() method in C# with an example.

The C# String.IsNullOrEmpty() method is used to check whether the specified string is null or an empty string. It returns a boolean value either true or false.

C# String IsNullOrEmpty Method Example

The following example demonstrates the use of the String.IsNullOrEmpty() method:

using System;

public class StringDemo
{
    public static void Main(string[] args)
    {
         string s1 = "sourcecodeexamples";
        
         string s2 = "";
         
         string s3 = null;
         
         bool b1 = string.IsNullOrEmpty(s1);  
         bool b2 = string.IsNullOrEmpty(s2);  
         bool b3 = string.IsNullOrEmpty(s3);  
       
         Console.WriteLine(b1);  
         Console.WriteLine(b2);  
         Console.WriteLine(b3);  
        
    }

}

Output:

False
True
True

Related C# String Examples

1. C# String Clone Method Example
2. C# String Compare Method Example
3. C# String CompareTo Method Example
4. C# String Concat Method Example
5. C# String Contains Method Example
6. C# String Copy Method Example
7. C# String CopyTo Method Example
8. C# String EndsWith Method Example
9. C# String Equals Method Example
10. C# String GetEnumerator Method Example
11. C# String GetHashCode Method Example
12. C# String IndexOf Method Example
13. C# String Insert Method Example
14. C# String Intern Method Example
15. C# String IsNullOrEmpty Method Example
16. C# String IsNullOrWhiteSpace Method Example
17. C# String LastIndexOf Method Example

References

https://docs.microsoft.com/en-us/dotnet/api/system.string.isnullorempty?view=net-6.0