Why Visual Studio ask me to Find Source Code of SQLiteCommand.cs

I am using C# on Visual Studio 2015, developing a simply database utility with SQLite libaray "sqlite-netFx40-binary-x64-2010-1.0.99.0" downloaded from: http://ift.tt/1p6GLAv. The program works find, but the Visual Studio sometimes poped a browsing dialog out, prompting me to identify the source code of SQLite. But in fact I only downloaded the library. So I would like to ask: Why this happens? How to disable that?

There is a screenshot about what I encountered