How to get file link ignoring space value

Hi all
       there is a control on my form
<a id="programmaticID" runat="server" name="bookmarkname" target="linkedcontentframeorwindow" title="titledisplayedbybrowser" visible="true">linktext </a>
and on a button click I am doing; the typed text in textbox it get converted into a link
protected void Button1_Click(object sender, EventArgs e)
    {
        if (txtAttach.Text == "")//(txtAttach is a <asp:TexBox control)
        {
            lblDateMsgs.Text = "Please give the path in textbox";// your shared drive's path
            lblDateMsgs.Visible = true;
        } Go to the complete details ...