Hi

i need help in winform application using VS 2005
i got this warning, what does it mean?
please help... thanks in advance..

"A first chance exception of type 'System.InvalidOperationException' occurred in System.Data.dll"

Private Sub Form1_Load
    Try
       Call InsertDAtagridProduct()
    Catch ex As Exception

        End Try
End Sub

Private Sub InsertDAtagridProduct()
        Dim myBook As New clsBook
        Dim strFilter As String
        Try
            If txtFilter.Text = "" Then
                strFilter = ""
            Else
                strFilter = Trim(txtFilter.Text)
            End If
 '================================================= ========================
            If myBook.GetBookData(strFilter) = True Then
                dgproduct.DataSource = ds
                dgproduct.DataMember = "Product"
        conn.Close()
            Else
                MessageBox.Show("No Record Found")
            End If

        Catch ex As Exception

        End Try
End Sub

================================
Imports System.Data.SqlClient

Public Class clsBook
    Public Function GetBookData(Optional ByVal pi_strFilter As String = "") As Boolean
        Try
            conn.Open() 'after execute this line, i can't go into below line as catch the warning like above and will get ("No Record Found")
            Dim strcmd As String, strW As String
            strW = ""
            If pi_strFilter <> "" Then
                strW = " ProductName like '%" & pi_strFilter & "%'"
            End If
            strcmd = "SELECT ProductID, ProductName,ProductTypeName,Description, " _
                        & "Stock FROM tblProduct a LEFT JOIN tblProductType b " _
                        & "ON a.ProductType = b.ProductTypeID" _
                        & IIf(strW = "", "", " WHERE " & strW)

            da = New SqlDataAdapter(strcmd, conn)
            ds = New DataSet("Product")
            da.Fill(ds, "Product")
            GetBookData = True
            conn.Close()
        Catch ex As Exception
            conn.Close()
            GetBookData = False
        End Try

    End Function
End Class

=============================
Imports System.Data.SqlClient

Module modConnection
    Public conn As New SqlConnection("Data Source=(local);Initial Catalog=TESTING;Integrated Security=True")
    Public dr As SqlDataReader
    Public da As New SqlDataAdapter
    Public ds As New DataSet
    Public cmd As New SqlCommand
End Module