http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspxC# defines a number of aliases for CLR types. They may be used interchangably, and even mixed together, e.g. string x = new System.String(' ', 5); . These are the aliases defined: Alias CLR type string System.String en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#10288421Wed, 28 Mar 2012 11:48:21 GMT91d46819-8472-40ad-a661-2c78acb4018c:10288421Arfa <p>@williams Alkali: the same difference as the difference between a spoon and a matchbox :P</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10288421" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#10228419Fri, 21 Oct 2011 01:12:54 GMT91d46819-8472-40ad-a661-2c78acb4018c:10228419Jeeshenlee<p>string is like an alias/shorthand for System.String. Similarly, int is an alias/shosthand for System.Int16.</p> <p><a rel="nofollow" target="_new" href="http://www.jeeshenlee.com/2011/10/difference-between-string-and.html">www.jeeshenlee.com/.../difference-between-string-and.html</a></p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10228419" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#10221083Thu, 06 Oct 2011 11:21:10 GMT91d46819-8472-40ad-a661-2c78acb4018c:10221083williams Alkali<p>what is the differences between a string and a language?</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10221083" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#10134088Fri, 25 Feb 2011 14:48:06 GMT91d46819-8472-40ad-a661-2c78acb4018c:10134088cn73<p>DateTIme is a Struct!! (value type)... String is a Sealed Class, so you can use as a Object ;)</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10134088" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#9974223Sat, 06 Mar 2010 23:52:50 GMT91d46819-8472-40ad-a661-2c78acb4018c:9974223elife<p>Here is a post which explains the difference between a bool and a boolean</p> <p><a rel="nofollow" target="_new" href="http://dotnetrobert.com/?q=node/22">http://dotnetrobert.com/?q=node/22</a></p> <p>Hope you find it useful.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=9974223" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#8903438Thu, 28 Aug 2008 17:27:37 GMT91d46819-8472-40ad-a661-2c78acb4018c:8903438 Afinal, qual a diferen&#231;a de string e String? - Rafael Silva <p>PingBack from <a rel="nofollow" target="_new" href="http://sharpcode.com.br/blogs/rafaelsilva/archive/2008/08/28/afinal-qual-a-diferen-231-a-de-string-e-string.aspx">http://sharpcode.com.br/blogs/rafaelsilva/archive/2008/08/28/afinal-qual-a-diferen-231-a-de-string-e-string.aspx</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=8903438" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#197070Mon, 26 Jul 2004 14:04:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:197070MaxString s; <br>DateTime dt; <br> <br>if (dt == null) // error, because DateTime is value type <br>if (s == null) // ok (because reference type?) <br>Response.Write(dt); // writes &quot;01.01.0001 00:00:00&quot; <br>Response.Write(s); // writes &quot;&quot;, although s=null, why?<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=197070" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#127617Fri, 07 May 2004 02:08:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:127617haibool System.Boolean <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=127617" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#88625Fri, 12 Mar 2004 16:44:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:88625Boris LetochaI think that void is also System.Void, but it is not interchable in C#, isn't it? <br> <br><div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=88625" width="1" height="1">http://blogs.msdn.com/b/csharpfaq/archive/2004/03/12/what-s-the-difference-between-code-string-code-and-code-system-string-code.aspx#88520Fri, 12 Mar 2004 13:34:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:88520Adam WeigertAre these aliases just like aliasing a type in the using statement? <br> <br>So in effect, I could create my own aliases that match VB.NET data types? <br> <br>using Byte = System.Byte <br>using Short = System.Int16; <br>using Integer = System.Int32; <br>using Long = System.Int64; <br> <br>Not saying that I would want to, but hey you could, right? :p<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=88520" width="1" height="1">