Problem is you need to get UNC path for f:\\ drive. Once you get actual network path, you can replace that in Connection string.

You can use WNetGetConnection function http://msdn.microsoft.com/en-us/library/aa385453(VS.85).aspx do get actual path from novel server for your f:\\ drive

or refer 

Converting a mapped drive letter to a network path using C# here:

http://www.wiredprairie.us/blog/index.php/archives/22