To learn about SQL Database connection strings to connect your Ms SQL Database with ASP.Net 2.0 web applications read the following article. You will learn about web.config settings such as using AppSettings and Connection Strings, SQL Connection String and ODBC connection string.
Click here to read more on SQL and ODBC Connection Strings

Learn C# code for SQL Database Connection in ASP.Net 2.0 and get source code to check sql database connection:
Click here to read more on ASP.Net C# Database Connection

Learn VB code to connect to SQL Database and get source code to check sql database connection:
Click here to read more on ASP.Net Connect to SQL Database

Learn C# code for Oledb connectivity in ASP.Net 2.0 with Ms Access Database:
Click here to read more on ASP.Net C# access database

Learn VB code for Object linking and embedding database connectivity in ASP.Net 2.0 with Ms Access Database:
Click here to read more on ASP.Net Connect to Access Database

Learn C# code for Open Database Connectivity (ODBC) of Ms Access Database with ASP.Net 2.0 web application. Add DSN from administrative tools Data Sources (ODBC) for accessing Ms Access Database file in your web application
Click here to read more on ASP.Net 2.0 Access Database

Learn VB code for Open Database Connectivity of Ms Access Database with ASP.Net 2.0 web application. You can use DSN for accessing Ms Access Database file in your web application
Click here to read more on ASP.Net Access Database Connection