Please help need to see the rdate range from the pickup date of last month to todays date...Whats wrong with this code

Imports CrystalDecisions.CrystalReports.Engine
Imports CrystalDecisions.Shared
Public Class report

Public intv As Integer

Private Sub Report_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    cmbreporttype.Items.Add("Registrationform")
    cmbreporttype.Text = "--select--"
    datefrom.MaxDate = Today
    dateto.MaxDate = Today
    connect()
End Sub

Sub Registrationform(ByVal fromdate As String, ByVal todate As String)
    Dim rd As New CrystalDecisions.CrystalReports.Engine.ReportDocument
    Dim rs As New ADODB.Recordset
    Dim sql As String = "select * from postoffice where date between '" & datefrom.Value & "' and '" & dateto.Value & "'"

    rs.Open(sql, cn)
    rd.Load(Application.StartupPath & "\Registrationform.rpt")
    If Not rs.EOF Then
        rd.Load(Application.StartupPath & "\Registrationform.rpt")
        rd.SetDataSource(rs)
        RegistrationformRPT.CrystalReportViewer1.ReportSource = rd
        RegistrationformRPT.Show()
    Else
        MsgBox("Data not found!")
    End If
End Sub
Private Sub Button2_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

End Sub

Private Sub cmbreporttype_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmbreporttype.SelectedIndexChanged
    intv = DateDiff(DateInterval.Day, datefrom.Value, Today)
    If intv < 0 Then

        MsgBox("date from cannot exceed date to")
        datefrom.Value = Today
        dateto.Value = Today
    Else : cmbreporttype.Text = "Registrationform"
        Registrationform(Format(datefrom.Value, "MM/dd/yyyy"), Format(dateto.Value, "MM/dd/yyyy"))
    End If

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    admin.Show()
    Me.Hide()
End Sub
Private Sub dateto_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles dateto.LostFocus
    Dim intav As Integer = DateDiff(DateInterval.Day, dateto.Value, Today)
    If intav < 0 Then
        MsgBox("Date cannot Exceed todays Date")
        dateto.Value = Today
    End If
End Sub

Private Sub datefrom_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles datefrom.LostFocus
    Dim intav As Integer = DateDiff(DateInterval.Day, datefrom.Value, Today)

    If intav < 0 Then
        MsgBox("Date cannot Exceed todays Date")
        datefrom.Value = Today
    End If
End Sub

End Class

The SQL statement looks wrong ( not sure which database you are using)
select * from postoffice where date between '" & datefrom.Value & "' and '" & dateto.Value & "'"
try
select * from postoffice where date => '" & datefrom.Value & "' and date <='" & dateto.Value & "'"

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