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protected void Page_Load(object sender, EventArgs e)
{
if (Request.HttpMethod == "POST")
{
string savaPath = "D:\\" + Path.GetFileName(this.FileUpload1.PostedFile.FileName);
this.FileUpload1.PostedFile.SaveAs(savaPath);
}
}
<form id="f" runat="server">
<asp:FileUpload ID="FileUpload1" runat="server" />
<script for="FileUpload1" event="onchange">
document.forms[0].submit();
</script>
</form>
<asp:FileUpload ID="FileUpload1" runat="server" />
<script for="FileUpload1" event="onchange">
document.forms[0].submit();
</script>