What should I write there in button event to show report between two dates?

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VB

I know how to show record by one parameter. But what should I write there in my button event to show record by two parameter? I have created two parameter & I have written it {asst.dt}= {?fdt} and {asst.dt} = {?ldt} there in formula workshop. Now I got a problem! I have a button there in my form with two text boxes with one report viewer. Before I had written following code. So what should I write now? Please help me.

Code(I have used it to show report by one parameter where form had one text box one button & one report viewer).

Code : Imports CrystalDecisions.CrystalReports.Engine
Imports CrystalDecisions.Shared
Public Class Form6
Inherits System.Windows.Forms.Form


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim cryRpt As New ReportDocument
cryRpt.Load(Application.StartupPath \CrystalReport5.rpt")
CrystalReportViewer1.ReportSource = cryRpt
CrystalReportViewer1.Refresh()

Dim cryRpt As New ReportDocument
cryRpt.Load(Application.StartupPath \CrystalReport5.rpt")

Dim crParameterFieldDefinitions As ParameterFieldDefinitions
Dim crParameterFieldDefinition As ParameterFieldDefinition
Dim crParameterValues As New ParameterValues
Dim crParameterDiscreteValue As New ParameterDiscreteValue

crParameterDiscreteValue.Value = TextBox1.Text
crParameterFieldDefinitions = cryRpt.DataDefinition.ParameterFields
crParameterFieldDefinition = crParameterFieldDefinitions.Item
crParameterValues = crParameterFieldDefinition.CurrentValues

crParameterValues.Clear()
crParameterValues.Add(crParameterDiscreteValue)
crParameterFieldDefinition.ApplyCurrentValues(crParameterValues)

CrystalReportViewer1.ReportSource = cryRpt
CrystalReportViewer1.Refresh()
cryRpt.RecordSelectionFormula = {Button1}= TextBox1.Text
End Sub