C# FAQ: Are CSharp strings immutable
Microsoft .NET Framework, ASP.NET, Visual C# (CSharp, C Sharp, C-Sharp) Developer Training, Visual Studio
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Are C# strings immutable?
Both the Java and C# string classes—C#: System.String, Java: java.lang.String—are immutable. Immutable means that—once created—string values cannot be changed. Methods which may seem to modify string contents, in fact, create a new string containing the new value. The original string remains unchanged.
The following examples do not modify the strings in question but return new strings containing the desired modifications:
String aString = "C# Online.NET"; // C# example aString.ToLower();
The C# String class can be written either as String or string.
String aString = "C# Online.NET"; // Java example aString.toLowerCase();
To create a string type object which does allow modification, use a mutable type string class—C#: System.Text.StringBuilder, Java: java.lang.StringBuffer.
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