Graph:

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http://zedgraph.sourceforge.net/

－Are you looking for a way to draw 2D line graphs with C#? Here's yet another charting class library with a high degree of configurability that is also easy to use.

s

http://nmath.sourceforge.net/wiki/index.php/Main_Page

－Math.NET is a mathematical open source library written in C#. Math.NET aims to provide a self contained clean framework for symbolic mathematical (CAS, Computer Algebra System), and also for numerical / scientific computations.

http://netcontrols.org/nplot/

NPlot is a free charting library for .NET. It boasts an elegant and flexible API.

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Email:

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http://www.codeproject.com/aspnet/XYEMailService.asp

－A .NET web service for e-mail

Sending e-mail using a web service.  

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C#

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http://blog.csdn.net/cnyifeng/archive/2004/06/28/28795.aspx

.NET好工具集合(转录)

http://blog.csdn.net/koy0755/archive/2005/02/19/294176.aspx

新浪短信Web Service 简介

http://www.pacific-hotel.com/en/index.html

Pacific Hotel Management Group

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