default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.PostedFile.ContentLength != 0)
        {
            string FileName = FileUpload1.PostedFile.FileName.ToString();
            if (File.Exists(FileName))
            {
                File.Delete(FileName);
                Page.RegisterStartupScript("", "<script>alert('操作成功')</script>");
            }
        }
        else
        {
            Page.RegisterStartupScript("", "<script>alert('请选择要删除的文件')</script>");
        }
    }
}