The following are some of the tools (non-exhaustive) to conduct a "Performance Test" on ASP.Net web applications. Do share with us the ones you are using too.
- Web Capacity Analysis Tool (WCAT)
A lightweight HTTP load generation tool primarily designed to measure the performance of a web server within a controlled environment.
- IIS Log Parser
A powerful, versatile tool that provides universal query access to text-based data
- NetStat
A command-line tool that displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics.
- Performance Monitor
A simple yet powerful visualization tool for viewing performance data, both in real time and from log files.
- Microsoft Network Monitor
A protocol analyzer that allows you to capture network traffic, view and analyze it.
- Redgate ANTS Performance Profiler
A tool that provides .NET code profiling, integrated SQL and File I/O analysis, and powerful visualizations give you the most complete picture of your application's performance.
- Fiddler
A Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet.
- Firebug
Integrates with Firefox to put a wealth of web development tools at your fingertips while you browse.
- Google Page Speed
Evaluates the performance of web pages and get suggestions on how to improve them.
- Yahoo YSlow
Analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
- Visual Studio Team Foundation Test Suite
An edition of Visual Studio that provides capabilities to perform various forms of testing.