file upload control inside grid view --> on row command

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C#

ASP.NET

hi all...

am using file upload control like
<asp:GridView ID="GridView1" CellPadding="4" runat="server" OnRowCommand="GridView1_RowCommand" AutoGenerateColumns="false" AllowPaging="true" AllowSorting="true" PageSize="5" Width="95%" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowDeleting="GridView1_RowDeleting">
<alternatingrowstyle backcolor="aliceBlue">
<HeaderStyle HorizontalAlign="Left" />
<columns> <asp:TemplateField Visible="false">
<itemtemplate>
<asp:Label ID="eid" runat="server" Text='<%# Eval("uid") %>'>


<asp:BoundField DataField="ccode" HeaderText="Company Code" />
<asp:BoundField DataField="cname" HeaderText="Company Name" />
<asp:TemplateField HeaderText="Company Logo">
<itemtemplate>
<asp:Image ID="LogoImage" ImageUrl="~/images/logo-not-available.jpg" runat="server"
Height="80px" Width="150px" />


<asp:TemplateField Visible="false">
<itemtemplate>
<asp:Label ID="logopathlbl" runat="server" Text='<%# Eval("logopath") %>'>


<asp:TemplateField HeaderText="Logo Upload">
<itemtemplate>
<asp:FileUpload ID="FileUpload4" runat="server" />
<asp:Button ID="bt_upload" runat="server" EnableViewState="False" Text="Upload" CommandName="Upload" />


on code behind
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
Button bts = e.CommandSource as Button;
Response.Write(bts.Parent.Parent.GetType().ToString());
if (e.CommandName.ToLower() == "upload")
{
FileUpload fu = bts.Parent.Parent.FindControl("FileUpload4") as FileUpload;
if (fu.HasFile)
{

}
}

}
fu object finding fileupload control but not taking the file name i con't save file
am not getting file can any one help me please
thanks in advance