Win7 Bit64, the 64-bit client is installed.
1. Plsql Connection Database
(1) Download Instantclient-basic-win32-11.2.0.1.0.zip extract to Oracle headlines now, and create a new Network/admin/tnsnames.ora (2) to configure the Plsql Oracle directory, such as: Ok!
2,. NET connection database
vs Debug Error, "Please check if the database was started when attempting to load an Oracle client, BadImageFormatException. If you are running in 64-bit mode with 32-bit Oracle client components installed, this issue occurs because the webserver in VS is only 32 bits, The equivalent of 32-bit calls to the 64-bit Oracle client. Workaround: (1) Use IIS for debugging, such as: (2) You need to create a new virtual directory, and the "Application pool" is 32 bits, such as: (3) Configure "Environment variables" such as: Change path to a place with Plsql call.
Windows7 64bit installation of Oracle 11g R2