<asp:FileUpload ID="multipleFile" runat="server"
AllowMultiple="true" />
<asp:Button ID="uploadFile" runat="server" Text="Upload files" onclick="uploadFile_Click"/>
In code behind protected void uploadFile_Click(object sender, EventArgs e)
{
if (multipleFile.HasFiles)
{
foreach(HttpPostedFile uploadedFile in multipleFile.PostedFiles)
{
uploadedFile.SaveAs(Path.Combine(Server.MapPath("~/Images/"),uploadedFile.FileName));
Response.Write("Successfully file uploaded");
}
}
}