Naming conventions in programming languages have potential benefits to reduce the effort needed to read and understand source code and provide better understanding in case of code reuse after a long interval of time. It's a initial step for beginner to learn any programming language and It later becomes a habit. Here are some good resources for .NET web developers.

.NET:

Microsoft’s Design Guidelines for Class Library Developers (via MSDN Library)

CodePlex: All-In-One Code Framework with Coding Guidelines

C# Coding Standards for .NET By Lance Hunt

The IDesign C# Coding Standard

Quick View of Coding Guidelines

ASP.NET:

ASP.NET AJAX Design and Naming Guidelines

Javascript:

Code Conventions for the JavaScript Programming Language

Database:

Database object naming conventions

SQL Server Guidelines

Hope, It's helpful for beginners. Share what guidelines you are following in below comment box.