VoiceNextClient missing refrence about example-bots HOT 2 CLOSED

For me the problem is even deeper. I have got a weird bot behavior on "leave" command. I have tried writing it by myself, also tried several examples like this official one https://github.com/DSharpPlus/Example-Bots/tree/master/DSPlus.Examples.CSharp.Ex04
The error is always the same:
Bot can join to channel, but on "leave" command he always giving me an answer "Not connected in this guild.", even tho he is ;P https://prnt.sc/stxz1q
I have brazenly copy-pasted code from example above (changed token ofc), but even tho in "Main" cs file 'voice' is defined and not null, inside command 'leave' - VoiceNextConnection is giving me null.
I had never stucked that hard while developing discord bots in node.js.
There cannot be a problem with bot permissions, because I use the same discord bot application with same permissions, that I`ve used before on my node.js bot. I just took the token, and passed it in another project.
Here is some information for people that have a chance to give me a solution to this problem.
DSharpPlus/CommandsNext/Interactivity/VoiceNext/ v3.2.3,
.Net Core 3.1,
Windows 10,
VS 19,

           public VoiceNextClient Voice { get; set; }
...
            var vcfg = new VoiceNextConfiguration
            {
                VoiceApplication = VoiceApplication.Music
            };
            this.Voice = this.Client.UseVoiceNext(vcfg);

            if (vnc == null)
            {
                //VoiceNextConnection is always null
                await ctx.RespondAsync("Not connected in this guild.");
                return;
            }

Thanks for everyone who have read this mess!

from example-bots.

The solution to this problem is reading the docs.

from example-bots.