Question

How to make reference from XML comment of UpdateChanged to Long1 field?

public sealed class SystemConfiguration
{
    public long Long1;

    /// <summary>
    /// Make reference to Long1
    /// </summary>
    public bool UpdateChanged;
}

Answer 1

You can use <see cref="SystemConfiguration.Long1"/>.

Visual Studio generates an XML documentation file where each member is assigned an unique ID. You can check the rules for ID generation at:

Processing the XML File

In this situation the full ID that will be generated is F:YourNamespace.SystemConfiguration.Long1. However you can use the shorter version because you are in the same class.