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VS 2019 Login Form Help

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Hi, I'm currently doing a Holiday Booking System for my A Level Assessment.

The Form is fully functional but there's an error which I am unsure on how to fix as I am not completely advanced at Visual Basic.

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As you can see I have successfully logged in, although the error message for an incorrect username or password is still appearing. Just to mention the username's and password's are attached to a .txt file, whether this has an impact on that, I'm unsure

Code:

    Private Sub BtnLogin_Click(sender As Object, e As EventArgs) Handles btnLogin.Click

        'Opens Accounts File
        FileOpen(1, "Accounts.txt", OpenMode.Random,,, Len(strLogin))

        Do While Not EOF(1)
            FileGet(1, strLogin,)

            'Allow acess if Username and Password are Matched and Correct
            If Trim(strLogin.Username) = txtUsername.Text And Trim(strLogin.Password) = txtPassword.Text Then
                MainMenu.Show()
                txtUsername.Clear()
                txtPassword.Clear()
                Me.Hide()
            End If
        Loop

        If Trim(strLogin.Username) IsNot txtUsername.Text Or Trim(strLogin.Password) IsNot txtPassword.Text Then
            MessageBox.Show("Username or Password are incorrect.")
        End If

        FileClose(1)
    End Sub

Above is the code I have for this part of the login. Is someone able to help me in correcting this? If not then no worries.

I also apologise if I have posted this to the wrong section of the forum, but I am new.

Thank you and Have a nice day :)
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