Enable the fileupload control of ASP. NET to support automatic browsing and uploading.

By default, the fileupload control does not support onchange events on the server side.

The onchange event of the client is used to call the _ dopostback method to use The onclick event of linkbutton to simulate an event triggering process.CodeAs follows:

Client:

<Asp: fileupload id = "fuphoto" onchange = "javascript :__ dopostback ('lbuploadphoto ','')"
Runat = "server" tooltip = "select image"/>

<Asp: linkbutton id = "lbuploadphoto" runat = "server" onclick = "lbuploadphoto_click"> </ASP: linkbutton>

Background code:

// Automatic upload event
Protected void lbuploadphoto_click (Object sender, eventargs E)
{
Fileupload ();
}

// Upload a file from the control
Public void fileupload ()
{
If (fuphoto. postedfile! = NULL & fuphoto. postedfile. contentlength> 0)
{
String ext = system. Io. Path. getextension (fuphoto. postedfile. filename). tolower ();
If (EXT! = ". Jpg" & ext! = ". Jepg" & ext! = ". BMP" & ext! = ". GIF ")
{
Return;
}
String filename = "image _" + datetime. Now. tostring ("yyyymmddhhmmss") + ext;
String Path = "./uploadphoto/" + filename;
Fuphoto. postedfile. saveas (server. mappath (PATH ));
Response. Redirect ("imagecut. aspx? Picurl = "+ server. urlencode (PATH ));
}
Else
{
// Do some thing;
}
}