// Union creates a new permission that is the union of the current permission and the specified permission.
private bool UnionDemo()
{

    bool returnValue = true;

    StrongNameIdentityPermission snIdPerm1, snIdPerm2;
    IPermission snIdPerm3;

    snIdPerm1 = new StrongNameIdentityPermission(blob, "MyCompany.MyDepartment.*", new Version("1.0.0.0"));
    snIdPerm2 = new StrongNameIdentityPermission(blob, "MyCompany.MyDepartment.MyFile", new Version("1.0.0.0"));

    snIdPerm3 = (StrongNameIdentityPermission)snIdPerm1.Union(snIdPerm2);

    try
    {
        Console.WriteLine("The union of MyCompany.MyDepartment.*" +
        "and MyCompany.MyDepartment.MyFile is " +
        ((StrongNameIdentityPermission)snIdPerm3).Name.ToString());
    }
    catch (Exception e)
    {
        Console.WriteLine("An expected exception was thrown: " + e.Message);
    }

    return returnValue;
}