在Update Panel 控件里面添加 File Upload 控件 上传文件
Detail Information:http://www.codeproject.com/Articles/482800/FileplusUploadplusinplusUpdateplusPanel
必须设置PostBackTrigger 属性
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:FileUpload ID="fileUploadImage" runat="server"></asp:FileUpload> <asp:Button ID="btnUpload" runat="server" Text="Upload Image" OnClick="btnUpload_Click" /> <br /> <asp:Button ID="btnProcessData" runat="server" Text="Process Data" OnClick="btnProcessData_Click" /><br /> <asp:Label ID="lblMessage" runat="server" Text="Image uploaded successfully." Visible="false"></asp:Label><br /> <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1"> <ProgressTemplate> Please wait image is getting uploaded.... </ProgressTemplate> </asp:UpdateProgress> <br /> <b>Please view the below image uploaded</b><br /> <asp:Image ID="img" runat="server" Width="100" Height="100" ImageAlign="Middle" /> </ContentTemplate> <Triggers> <asp:PostBackTrigger ControlID="btnUpload" /> <asp:AsyncPostBackTrigger ControlID="btnProcessData" /> </Triggers> </asp:UpdatePanel>