.NET (Core and Framework)

// Should we always have a separate _userManager injected?
var userId = await _userManager.GetUserIdAsync(user);

// Or would this also work, but some may not like the multiple chaining?
var userId = await _signInManager.UserManager.GetUserIdAsync(user);

An unhandled exception of type 'System.InvalidCastException' occurred in System.Data.dll
Additional information:

Dim len As Long = rd.GetBytes(0, 0, Nothing, 0, 0)
Dim array(CInt(len)) As Byte
rd.GetBytes(0, 0, array, 0, CInt(len))
pic = New PictureBox

Dim ms As New System.IO.MemoryStream(array)
Dim bitmap As New System.Drawing.Bitmap(ms)
pic.BackgroundImage = bitmap

Imports System.Data.OleDb
Public Class Form1
    Dim con As OleDbConnection
    Dim cmd As OleDbCommand
    Dim rd As OleDbDataReader

    Private WithEvents pic As New PictureBox

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        'Dim con As OleDbConnection
        'Dim cmd As OleDbCommand
        'Dim rd As OleDbDataReader

        con = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\database.accdb;")
        con.Open()

        cmd = New OleDbCommand("select * from MyTable", con)
        rd = cmd.ExecuteReader
        MsgBox("connected")

        con.Close()
        MsgBox("disconnected")
    End Sub

    Sub LoadData()
        con = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\database.accdb;")
        con.Open()
        cmd = New OleDbCommand("select * from MyTable", con)
        rd = cmd.ExecuteReader
        While rd.Read
            Dim len As Long = rd.GetBytes(0, 0, Nothing, 0, 0)
            Dim array(CInt(len)) As Byte
            rd.GetBytes(0, 0, array, 0, CInt(len))
            pic = New PictureBox

            Dim ms As New System.IO.MemoryStream(array)
            Dim bitmap As New System.Drawing.Bitmap(ms)
            pic.BackgroundImage = bitmap

            FlowLayoutPanel1.Controls.Add(pic)

        End While
        rd.Close()
        con.Close()
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        LoadData()
    End Sub
End Class