Asp.net C#上传文件

前台代码:<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" /><%--上传文件的控件--%>
<asp:Button ID="Button1" runat="server" OnClick="UploadFiles" Text="提交" /><%--提交上传的文件--%>
</div>
</form>后台代码
protected void UploadFiles(object sender, EventArgs e)
{
try
{
if (HttpContext.Current.Request.Files.Count > 0)
{
//System.Web.HttpPostedFile Provides access to individual files that have been uploaded by a client.
HttpPostedFile postedFile = HttpContext.Current.Request.Files[0];//获得用户提交的文件

string savePath;
string dir = HttpContext.Current.Request.PhysicalApplicationPath;//当前应用程序的根目录
savePath = dir + "Upload/DocumentFiles/";//保存文件的目录,要事先添加,不会自己添加
string date = DateTime.Now.ToString("yyyy-M-d") + "-" + DateTime.Now.Hour.ToString() + "-" + DateTime.Now.Minute.ToString() + "-" + DateTime.Now.Second.ToString() + "-";//根据自己需要添加
savePath +=date+Path.GetFileName(postedFile.FileName);
if (File.Exists(savePath))
{
File.Delete(savePath);//如果文件已经存在就将已存在的文件删除
}
postedFile.SaveAs(savePath);//将用户提交的文件postedFile保存为savePath
}
}
catch (Exception ex)
{

}
}