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File Upload with Update Panel

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ASPX Page
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <Triggers>
                <asp:PostBackTrigger ControlID="Button2" />               
            </Triggers>
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server"></asp:Label>
                <asp:FileUpload ID="fupLogo" runat="server" Visible="False"></asp:FileUpload>
                <asp:Button ID="Button2" runat="server" Text="Upload" OnClick="Button2_Click" Visible="False" />
                <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="show Uploader " />
            </ContentTemplate>
        </asp:UpdatePanel>


Code Behind



protected void Button2_Click(object sender, EventArgs e)
    {
        if (fupLogo.HasFile)
        {
            string fileFormat = fupLogo.PostedFile.ContentType;
            Label1.Text = fupLogo.PostedFile.ContentType;
            if (string.Compare(fileFormat, "image/jpeg", true) == 0 ||
            string.Compare(fileFormat, "image/png", true) == 0 ||
            string.Compare(fileFormat, "image/gif", true) == 0)
            {
                Label1.Text += "file format supported<br/>";
            }
            else
            {
                Label1.Text += "file format not supported<br/>";
            }
        }
        else
        {
            Label1.Text += "file not exist<br/>";
        }
    }
 

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