Creating a login Form

Question

Im trying to create a login form but i do not really understand where i am not getting it.  Can anyone please look through my code and tell me where i am making a mistake.Below is my code.

Imports System.Data.OleDb

Public Class Form1
    Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\HP\Documents\regData.accdb")

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            con.Open()
            Dim cmd As New OleDbCommand("SELECT from regData WHERE username = '" & txtUsername.Text & "' and pswrd = '" & txtPasswrd.Text & "'", con)
            Dim sdr As OleDbDataReader = cmd.ExecuteReader()
            If sdr.Read = True Then
                MsgBox("Login Successful")
            Else
                MsgBox("CHECK Username/Password")
            End If
            con.Close()
        Catch ex As Exception
            MsgBox("ERROR!")
        End Try
       
    End Sub
End Class