Imports Telerik.WinControls
Imports Telerik.WinControls.UI
Imports System.IO

Public Class Form2

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ThemeResolutionService.ApplicationThemeName = "Office2010Blue"
    End Sub

    Private Sub Buttonregister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Buttonsignin.Click
        If (TextBoxpassword.Text = Nothing Or TextBoxusername.Text = Nothing) Then
            RadMessageBox.Show("All fields should be filled with proper information")
        Else

            Using reader As StreamReader = New StreamReader(My.Application.Info.DirectoryPath + "\" + TextBoxusername.Text)
                While Not reader.EndOfStream
                    Dim username As String = reader.ReadLine()
                    Dim password As String = reader.ReadLine()

                    If username = TextBoxusername.Text And password = TextBoxpassword.Text Then
                        RadMessageBox.Show("You have sucesfully signed in")
                    Else
                        RadMessageBox.Show("Invalid username or password")
                    End If
                End While
            End Using
        End If
    End Sub
End Class