Retrieve AssemblyCompanyName from Class Library

To get the assembly in which your current code (the class library code) actually resides, and read its company attribute:

Assembly currentAssem = typeof(CurrentClass).Assembly;
object[] attribs = currentAssem.GetCustomAttributes(typeof(AssemblyCompanyAttribute), true);
if(attribs.Length > 0)
{
    string company = ((AssemblyCompanyAttribute)attribs[0]).Company
}

The dotnet 5 version:

typeof(CurrentClass).GetCustomAttribute<AssemblyCompanyAttribute>().Company

Assembly assembly = typeof(CurrentClass).GetAssembly();
AssemblyCompanyAttribute companyAttribute = AssemblyCompanyAttribute.GetCustomAttribute(assembly, typeof(AssemblyCompanyAttribute)) as AssemblyCompanyAttribute;
if (companyAttribute != null)
{
    string companyName = companyAttribute.Company;
    // Do something
}

You could use the FileVersionInfo class to get CompanyName and much more.

Dim info = FileVersionInfo.GetVersionInfo(GetType(AboutPage).Assembly.Location)
Dim companyName = info.CompanyName
Dim copyright = info.LegalCopyright
Dim fileVersion = info.FileVersion