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Imports System.Data
Imports System.Data.OleDb
Public Class Form1
    Friend cn As OleDbConnection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=X:\DATA\Database4.accdb; Persist Security Info=False;")
    Friend cmd As New OleDbCommand
    Friend DA As New OleDbDataAdapter
    Friend DS As New DataSet
    Friend DR As OleDbDataReader
    Friend oledb As String = ""
    Friend Sub connect()
        If cn.State = ConnectionState.Closed Then cn.Open()
    End Sub
    Friend Function cmd_excuteScalar()
        connect()
        cmd = New OleDbCommand(oledb, cn)
        Return cmd.ExecuteScalar()
    End Function
    Friend Function cmd_excuteToDataTable()
        connect()
        DA = New OleDbDataAdapter(oledb, cn)
        DS = New DataSet
        DA.Fill(DS, "table")
        Return DS.Tables("table")
    End Function
    Private Sub btn_login_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_login.Click
        connect()
        oledb = "select count(*) from Member where Username='" & txt_username.Text & "' and Password='" & txt_password.Text & "'"
        Dim user_count As Integer = cmd_excuteScalar()
        If user_count <= 0 Then
            MsgBox("Login Fail")
        Else
            MsgBox("login ok")
            Me.Hide()
            main.Show()
        End If

        oledb = "select * from Member where Username='" & txt_username.Text & "' and Password='" & txt_password.Text & "'"
        Dim dts As DataTable = cmd_excuteToDataTable()
        With main
            .lbl_username.Text = dts.Rows(0)("username")
            .lbl_name.Text = dts.Rows(0)("name")
            .lbl_date.Text = Date.Now
        End With
    End Sub
End Class