Pass value froma form to another

[JustRun]

hi,

I have a problem with passing the value from a Form that "user should choose a start date and end date" to a Form that display the result in a Crystal Report Form

Actually it gives this error at runtime:
"SqlDateTim e overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM"

'The form that dates will be picked from 

Public Class frmBuyDate
    Public dateStart As String
    Public dateEnd As String

    Private Sub btnShowReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShowReport.Click
        dateStart = dpStart.Value.ToShortDateString
        dateEnd = dpEnd.Value.ToShortDateString
        'MessageBox.Show(dateStart.ToString())
        Dim objBuyRprt As New frmBuyRprt()
        objBuyRprt.ShowDialog()
    End Sub
End Class

'Here, both 'dateStart' and 'dateEnd' are Null !!!!!! This is the thing I want to know , WHY 
I always used to do this with C# and it works, whats wrong here?

Public Class frmBuyRprt

    Private Sub frmBuyRprt_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       Try
            Me.BUYSTableAdapter.FillByDate(PHARMACYDBDataSet.BUYS, Convert.ToDateTime(frmBuyDate.dateStart), Convert.ToDateTime(frmBuyDate.dateEnd))

            Dim objBuyRprt As New CrystalReport1
            objBuyRprt.SetDataSource(PHARMACYDBDataSet)
            crvBuy.ReportSource = objBuyRprt
        Catch ex As Exception
            MessageBox.Show(ex.ToString())

        End Try
      
    End Sub
End Class

'The Dataset Query'

SELECT  Med_ID, Med_Date, Med_Cat, Med_Name, Med_Qty, Med_Price, Med_TotalPrice
FROM         BUYS
WHERE     (D2 >= @startDate) AND (D2 <= @endDate)
ORDER BY D2 DESC

I tested the query and it works perfect, also the form of pickers works perfect.
Thanks.

[Enij]

I'm not sure if I'm following this correctly, but...

On your second code example, line 8, you're trying to use frmBuyDate, but I can't see any code where this class has been instantiated:

Dim myBuyDate As New frmBuyDate

myBuyDate.ShowDialog()

' test dialog result here
If myBuyDate.DialogResult = DialogResult.OK Then
' use myBuyDate.dateEnd / etc here
End If

' >> dereference form dialog

If no form has been instantiated, everything will be Nothing.

From the code provided, that's what it looks like to me anyway ;)