รู้วิธี Check ว่า Record ฟิวส์ไหนไม่มีให้เปรียบเอาอ่ะครับจะมีไหม

  Dim imgByte() As Byte = dataset.Tables("Employee").Rows(0)("Picture")
        Dim imgstremam As New MemoryStream(imgByte)
        PictureBox2.Image = Image.FromStream(imgstremam)

If dataset.Tables("Employee").Rows(0)("Picture") IsNot DBNull.Value Then 
      Dim imgByte() As Byte = dataset.Tables("Employee").Rows(0)("Picture")
      Dim imgstremam As New MemoryStream(imgByte)
      PictureBox2.Image = Image.FromStream(imgstremam)
End If

 Private Sub BtnNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnNext.Click
        Dim pos As Integer = Me.BindingContext(dataset, "Employee").Position
        Dim numRows As Integer = dataset.Tables("Employee").Rows.Count
        If (pos = (numRows - 1)) Then
            Return
        Else
            Me.BindingContext(dataset, "Employee").Position += 1
            pos += 1
            test(pos)
        End If
        updateStatus()
    End Sub
    Sub test(ByVal pos As Integer)
        If dataset.Tables("Employee").Rows(pos)("Picture") IsNot DBNull.Value Then
            Dim imgByte() As Byte = dataset.Tables("Employee").Rows(pos)("Picture")
            Dim imgstremam As New MemoryStream(imgByte)
            PictureBox2.Image = Image.FromStream(imgstremam)
        ElseIf dataset.Tables("Employee").Rows(pos)("Picture") Is DBNull.Value Then
            PictureBox2.Image = Nothing
            MessageBox.Show("งงมาก")
        End If
    End Sub