<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private string saveDir = @"Uploads\";
protected void UploadButton_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile && FileUpload1.FileBytes.Length < 10000 &&
!CheckForFileName())
{
string savePath = Request.PhysicalApplicationPath + saveDir +
Server.HtmlEncode(FileName.Text);
//Remove comment from the next line to upload file.
//FileUpload1.SaveAs(savePath);
UploadStatusLabel.Text = "The file was processed successfully.";
}
else
{
UploadStatusLabel.Text = "You did not specify a file to upload, or a file name, or the file was too large. Please try again.";
}
}
protected void CheckButton_Click(object sender, EventArgs e)
{
if (FileName.Text.Length > 0)
{
string s = CheckForFileName() ? "exists already." : "does not exist.";
UploadStatusLabel.Text = "The file name choosen " + s;
}
else
{
UploadStatusLabel.Text = "Specify a file name to check.";
}
}
private Boolean CheckForFileName()
{
System.IO.FileInfo fi = new System.IO.FileInfo(Request.PhysicalApplicationPath +
saveDir + Server.HtmlEncode(FileName.Text));
return fi.Exists;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>PostBackTrigger Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
The upload button is defined as a PostBackTrigger.<br/>
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<fieldset>
<legend>FileUpload in an UpdatePanel</legend>
First, enter a file name to upload your file to:
<asp:TextBox ID="FileName" runat="server" />
<asp:Button ID="CheckButton" Text="Check" runat="server" OnClick="CheckButton_Click" />
<br />
Then, browse and find the file to upload:
<asp:FileUpload id="FileUpload1"
runat="server">
</asp:FileUpload>
<br />
<asp:Button id="UploadButton"
Text="Upload file"
OnClick="UploadButton_Click"
runat="server">
</asp:Button>
<br />
<asp:Label id="UploadStatusLabel"
runat="server" style="color:red;">
</asp:Label>
</fieldset>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="UploadButton" />
</Triggers>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>