.NET Interview Questions 4 th Edition By Shivprasad ... - A2Z Dotnet

Now when we view the GAC we can see two version of “ClassLibraryVersion” i.e.
“1.1.1832.2619” and “1.0.1832.2172” (see figure below).
Figure 1.16: - Two version of “ClassLibraryVersion” dll.
Now that we have created the environment of two version of the same DLL in GAC its time to
look at how client can make a choice between those versions. We need to generate
“publicKeyToken” in order to move ahead. Below is a sample print screen, which shows how we
can use “sn.exe” to generated the public key token. Note the “-T” parameter.
Figure 1.17: - Get the PublicKeyToken
Now let us look at the client that will consume this DLL. I have just added windows form and a
button to the same. In the button click, we will try to call the version function and display the
data. Therefore, below is the code in the first step we create the object of
“ClassLibraryVersion.Class1” and in the second step we call the “Version” function to display
the data.
Figure 1.18: - Client code calling the GAC class.