The string type represents a string of Unicode characters. string is an alias for System.String in the .NET Framework. C# defines a number of aliases for CLR types which can be used interchangably or even mixed together.
eg. string x = new System.String(' ', 5); Although string is a reference type, the equality operators (== and !=) are defined to compare the values of string objects, not references. This makes testing for string equality more intuitive.
Some more defined C# aliases are:
| string | System.String |
| sbyte | System.SByte |
| byte | System.Byte |
| short | System.Int16 |
| ushort | System.UInt16 |
| int | System.Int32 |
| uint | System.UInt32 |
| long | System.Int64 |
| ulong | System.UInt64 |
| char | System.Char |
| float | System.Single |
| double | System.Double |
| bool | System.Boolean |
| decimal | System.Decimal |