Object reference not set to an instance of an object my .ascx
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" DataKeyNames="id_progress_legal_dokumen" DataSourceID="SqlDataSource4" PageSize="25" ShowHeaderWhenEmpty="True" CssClass="table table-striped table-condensed gvCustom" BackColor="White" AllowPaging="True" OnRowCommand="GridView2_RowCommand">
<Columns>
<asp:TemplateField HeaderText="Upload File">
<ItemTemplate>
<asp:FileUpload ID="fileupload1" runat="server" />
<asp:Button ID="bntUpload" runat="server" Text="Upload" OnClick="bntUpload_Click" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
event buttonclick My code behind ascx.cs
protected void bntUpload_Click(object sender, EventArgs e)
{
string folderpath = Server.MapPath("~/Upload/");
FileUpload fileupload = (FileUpload)GridView2.FindControl("fileupload1");
try
{
if(!Directory.Exists(folderpath))
{
Directory.CreateDirectory(folderpath);
}
//this my error
fileupload.SaveAs(folderpath + Path.GetFileName(fileupload.FileName));
}
catch (Exception ex)
{
myfeedback._error(ex);
}
}
where is my mistake ? //error fileupload.SaveAs(folderpath + Path.GetFileName(fileupload.FileName));