I haven’t used data source that much as I have been working on web projects for quite some time. Today, I gotta take a look at our previous Windows program and realized that nothing happened when I clicked ‘Show Data Sources’ or ‘Add New Data Source…’ from Data menu. I had to run this once to get it solved.
"C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /setup