Protected Sub btnLogin_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnLogin.Click

FormsAuthentication.SetAuthCookie(Me.txtUsername.Text.Trim(), chkRemember.Checked)
Dim returnUrl As String = String.Empty

        If Request.QueryString("ReturnUrl") Is Nothing Then
            returnUrl = "Dashboard.aspx"

        Else
            returnUrl = Request.QueryString("ReturnUrl")

        End If
        Response.Redirect(returnUrl)


    End Sub

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
   FormsAuthentication.SignOut()
 FormsAuthentication.RedirectToLoginPage()
End Sub