【文件上传】
public void BtnFileUpLoad()
{
try{

if (FileUpLoad.PostedFile.FileName != "")
{
string path = Server.MapPath("~/Uploads/");
string NowTime = DateTime.Now.ToString("yyyyMMddHHmmss");
int pos = FileUpLoad.FileName.IndexOf(".");
string Filename =NowTime + FileUpLoad.FileName;
string FileAll = path + Filename;
//string Filename =System.IO.Path.GetExtension(FileUpLoad.FileName);
FileUpLoad.SaveAs(path + Filename);
this.lbUpLoad.Text = "文件上传成功";
this.lbShowFile.Text = Filename;
}
else
{
this.lbUpLoad.Text = "";
}
}
catch (Exception ex)
{
this.lbUpLoad.Text = "上传发生错误! 信息:" + ex.ToString();
}
}

【文件下载】
public void BtnFileUpLoad()
{
try{

if (FileUpLoad.PostedFile.FileName != "")
{
string path = Server.MapPath("~/Uploads/");
string NowTime = DateTime.Now.ToString("yyyyMMddHHmmss");
int pos = FileUpLoad.FileName.IndexOf(".");
string Filename =NowTime + FileUpLoad.FileName;
string FileAll = path + Filename;
//string Filename =System.IO.Path.GetExtension(FileUpLoad.FileName);
FileUpLoad.SaveAs(path + Filename);
this.lbUpLoad.Text = "文件上传成功";
this.lbShowFile.Text = Filename;
}
else
{
this.lbUpLoad.Text = "";
}
}
catch (Exception ex)
{
this.lbUpLoad.Text = "上传发生错误! 信息:" + ex.ToString();
}
}

【文件删除】
protected void DeleteLoad_Click(object sender, EventArgs e)
{
string fileName = this.lbShowFile.Text;
string strFilePath = Server.MapPath("~/Uploads/" + fileName);
if (File.Exists(strFilePath))
{
File.Delete(strFilePath);
}

}

文件上传/下载/删除