C#

private Assembly AssemblyData = System.Reflection.Assembly.GetEntryAssembly();

// タイトル名
AssemblyData.GetName().Name;

// 会社名
GetCustomAttribute<AssemblyCompanyAttribute>().Company;

private T GetCustomAttribute<T>() where T : Attribute
{
    return (T)Attribute.GetCustomAttribute(AssemblyData, typeof(T));
}