asp.net file upload inside formview always return false (not in updatepanel) - asp.net

Question

I am using fileupload control inside formview edittemplate
<asp:FileUpload ID="fileup_profilfoto" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="Sadece şu formatlar (.jpg, .bmp, .png, .gif)" ValidationExpression="^.*\.(jpg|JPG|png|PNG|bmp|BMP|gif|GIF)$" ControlToValidate="fileup_profilfoto" ForeColor="#00C0CC"></asp:RegularExpressionValidator>
It was working.But I added an updatepanel then it didnt work,and then I remowed update panel.But it's still return false (hasfile)
protected void frmviewProfil_ItemUpdating(object sender, FormViewUpdateEventArgs e)
{
try
{
FileUpload fileup_profilfoto = (FileUpload)frmviewProfil.FindControl("fileup_profilfoto");
if (fileup_profilfoto.HasFile)
{
//do something
}
else
{
//do something
}
}
}
always goes else scopes.

Answer 1

hi use triggers to achive that
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server"></asp:Label><br /><br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
code behind
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
Label1.Text = FileUpload1.FileName;
}
}

Answer 2

Did you do anything to the properties of the fileupload control, for example setting the autopost back value to false? Try setting this to true if it is false.

Answer 3

I came across this question when I had this problem and figured I'd post what my problem and solution were as well.
Make sure the file you are trying to upload is larger than 0 bytes. I was trying to upload some blank text files for testing and each file had the FileName property set correctly, but HasFile was always false. Adding some text to the files gave it some content and the file was able to be uploaded successfully.