String.IsNullOrEmpty Method
.NET Framework 4.5
Indicates whether the specified string is null or an Empty string.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.String
The string to test.
Return Value
Type: System.Booleantrue if the value parameter is null or an empty string (""); otherwise, false.
The following example determines whether each of three strings has a value, is an empty string or is null.
using System; class Sample { public static void Main() { string s1 = "abcd"; string s2 = ""; string s3 = null; Console.WriteLine("String s1 {0}.", Test(s1)); Console.WriteLine("String s2 {0}.", Test(s2)); Console.WriteLine("String s3 {0}.", Test(s3)); } public static String Test(string s) { if (String.IsNullOrEmpty(s)) return "is null or empty"; else return String.Format("(\"{0}\") is neither null nor empty", s); } } // The example displays the following output: // String s1 ("abcd") is neither null nor empty. // String s2 is null or empty. // String s3 is null or empty.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
