I'm using YouTube Data Api v3 in order to retrieve the first searched video id by typing a title into a textbox. I'm doing it with this code:

Imports System
Imports System.Collections.Generic
Imports System.IO
Imports System.Reflection
Imports System.Threading
Imports System.Threading.Tasks
Imports Google.Apis.Auth.OAuth2
Imports Google.Apis.Services
Imports Google.Apis.Upload
Imports Google.Apis.Util.Store
Imports Google.Apis.YouTube.v3
Imports Google.Apis.YouTube.v3.Data
Public Class Form1

    Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

            Await Run()
        Catch ex As AggregateException

            For Each inner In ex.InnerExceptions
                MsgBox("Error: " & inner.Message)
        End Try
    End Sub
    Private Async Function Run() As Task
        Dim youtubeService = New YouTubeService(New BaseClientService.Initializer() With {
            .ApiKey = "API KEY",
            .ApplicationName = Me.[GetType]().ToString()
        Dim searchListRequest = youtubeService.Search.List("snippet")
        searchListRequest.Q = TextBox1.Text
        searchListRequest.MaxResults = 1
        Dim searchListResponse = Await searchListRequest.ExecuteAsync()
        Dim videos As List(Of String) = New List(Of String)()
        Dim channels As List(Of String) = New List(Of String)()
        Dim playlists As List(Of String) = New List(Of String)()

        For Each searchResult In searchListResponse.Items

            videos.Add(String.Format("{0} ({1})", searchResult.Snippet.Title, searchResult.Id.VideoId))


        MsgBox(String.Format("Videos:" & vbLf & "{0}" & vbLf, String.Join(vbLf, videos)))
    End Function
End Class

I now need to add that video into a known playlist through the end point playlistItems.insert which got a request body which is playlistItem resource that specifies at least the following values:

The snippet.playlistId identifies the playlist to which you are adding the video. This is the playlist ID you obtained in step 1. The snippet.resourceId.kind contains the value youtube#video. The snippet.resourceId.videoId identifies the video that you are adding to the playlist. The property value is a unique YouTube video ID.
As someone stated on some forum

You have to create a new PlaylistItemSnippet object, specify the PlayList ID, build a new ResourceId object, specify the Kind and VideoID and your ResourceID, add the RousourceId to the snippet ([snippet].setResourceId()? no sure), then [playlistItem].setSnippet([your snippet]). Create an insert request (should be dim request = youtubeService.playlistItems().insert("snippet", [the playlist item])) and dim result = request.execute()
but my problem is I am not able to reproduce it into code and make it work together with the code above that retrieve the video id. Can someone give me an hint? Thanks