<table width="100%">
    <tr>
    <td style="width:80%;"><asp:TextBox ID="txtFilePath" runat="server" CssClass="FlatTextbox" Width="100%" ReadOnly="true" ></asp:TextBox></td>
    <td style="width:10%; padding-left:15px"><asp:Button ID="btnText" runat="server" Text="" CssClass="FlatButton" Width="100%" onclick="btnText_Click" /></td>
    <td style="width:10%"><asp:FileUpload ID="fUpload" runat="server" Visible="false" OnClick="DoOpenFileDialog()"/></td>
    </tr>
    </table>

public partial class FilePathBrowser : System.Web.UI.UserControl
    {
        public event EventHandler BrowseClick;

        public string FilePathText
        {
            get { return txtFilePath.Text; }
            set { txtFilePath.Text = value; }
        }

        public string ButtonText
        {
            get { return btnText.Text; }
            set { btnText.Text = value; }
        }

        public FileUpload HiddenFileUploadCtrl
        {
            get { return this.fUpload; }
            set { fUpload = value; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnText_Click(object sender, EventArgs e)
        {
            BrowseClick(sender, e);
        }
    }

<UserControl:FPBrowser ID = "fpbImageUpload" runat = "server" ButtonText="Browse.." FilePathText="" OnBrowseClick="fpbImageUpload_BrowseClick"/>

protected void fpbImageUpload_BrowseClick(object sender, EventArgs e)
    {
        if (fpbImageUpload.HiddenFileUploadCtrl.HasFile)
        {
            String fileName = fpbImageUpload.HiddenFileUploadCtrl.FileName;
            fpbImageUpload.FilePathText = Path.Combine(Helper.FileUploadPath, fileName);
            fpbImageUpload.HiddenFileUploadCtrl.SaveAs(Path.Combine(Helper.FileUploadPath, fileName));
        }
    }