用fileupload上传文件

<asp:FileUpload ID="CVFileUpload" runat="server" />
<asp:Button ID="CVUpload" runat="server" Font-Overline="False" Font-Size="8pt" OnClick="CVUpload_Click"
     Text="Upload" CausesValidation="False" />
<asp:HyperLink ID="CV" runat="server" NavigateUrl='<%# Bind("CV") %>' Target="_blank"
     Visible="False">File Uploaded</asp:HyperLink>
<asp:Button ID="CVChangeButton" runat="server" Font-Size="8pt" OnClick="CVChangeButton_Click"
     Text="Change" Visible="False" CausesValidation="False" />

 

 

 

 

protected void CVUpload_Click(object sender, EventArgs e)
    {
        FileUpload myFile = (FileUpload)FormView1.FindControl("CVFileUpload");
        HyperLink hypl = (HyperLink)FormView1.FindControl("CV");
        if (myFile.PostedFile != null)
        {
            string nam = myFile.PostedFile.FileName;
            //取得文件名(抱括路径)里最后一个"."的索引
            int i = nam.LastIndexOf(".");
            //取得文件扩展名
            string newext = nam.Substring(i);
            //这里我自动根据日期和文件大小不同为文件命名,确保文件名不重复
            DateTime now = DateTime.Now;
            string newname = now.Year.ToString() + "_" + now.Month.ToString() + "_" + now.Day.ToString() + "_" + myFile.PostedFile.ContentLength.ToString();
            //保存文件到你所要的目录,这里是IIS根目录下的upload目录.你可以改变.
            //注意: 我这里用Server.MapPath()取当前文件的绝对目录.在asp.net里"\"必须用"\\"代替
            //myFile.PostedFile.SaveAs(Server.MapPath("http://www.cnblogs.com/liuweicfyj/admin/file://upload//" + newname + newext)); 
            String path = "Upload\\" + newname + newext;
            myFile.PostedFile.SaveAs(Server.MapPath(path));
            //得到这个文件的相关属性:文件名,文件类型,文件大小
            //fname.Text = myFile.PostedFile.FileName;
            //fenc.Text = myFile.PostedFile.ContentType;
            //fsize.Text = myFile.PostedFile.ContentLength.ToString();
            hypl.NavigateUrl = path;
            hypl.Visible = true;
            myFile.Visible = false;
            ((Button)FormView1.FindControl("CVUpload")).Visible = false;
            ((Button)FormView1.FindControl("CVChangeButton")).Visible = true;
        }

    }
    protected void CVChangeButton_Click(object sender, EventArgs e)
    {
        ((FileUpload)FormView1.FindControl("CVFileUpload")).Visible = true;
        ((Button)FormView1.FindControl("CVUpload")).Visible = true;
        ((Button)FormView1.FindControl("CVChangeButton")).Visible = false;
        ((HyperLink)FormView1.FindControl("CV")).Visible = false;

        File.Delete(Server.MapPath(((HyperLink)FormView1.FindControl("CV")).NavigateUrl));
        ((HyperLink)FormView1.FindControl("CV")).NavigateUrl = "";

    }