how to show "No Records Found " when searching records from database..!

 this is my code and i want to show no records when searching records from the database...!
plz solve my problem as soon as possible..!
 
 Protected Sub fndbtn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles fndbtn.Click

        Try
            Errlbl.Text = ""
            idtxt.Text = ""
            Dim str As String
            str = desctxt.Text
            If Len(Trim(str)) > 0 Then
                idtxt.Text = ""
           ...