C#表单实现文件上传

<form runat="server" id="myform"><table>    <tr><td align="right" >单位名称：</td><td align="left" >                <asp:TextBox ID="txtName" runat="server" Width="150px"  ></asp:TextBox>        </td><td >类型:</td><td align="left">            <asp:DropDownList ID="ddlType" runat="server" Width="150px" >                <asp:ListItem Value="true" Selected="True">文字链接</asp:ListItem>                <asp:ListItem Value="false">图片链接</asp:ListItem>            </asp:DropDownList>        </td></tr>        <tr><td align="right" >单位类型：</td><td align="left" >                <asp:DropDownList ID="ddlCooperateType" runat="server" Width="150px" >                <asp:ListItem Value="0" >高校</asp:ListItem>                <asp:ListItem Value="1" Selected="True">企业</asp:ListItem>            </asp:DropDownList>        </td><td >顺序排序:</td><td align="left">                <asp:TextBox ID="txtSort" runat="server" Width="150px"  Text="0"></asp:TextBox>        </td></tr>    <tr><td >链接:</td><td align="left">                <asp:TextBox ID="txtLink" runat="server" Height="17px" Width="150px"                      Text="http://www.qk12333.com"></asp:TextBox>                <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"                             ControlToValidate="txtLink" ErrorMessage="格式不正确！" ForeColor="Red"                                                            ValidationExpression="http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?"></asp:RegularExpressionValidator>        </td>        <td  >图片上传：</td><td align="left" >                <asp:FileUpload ID="fileUpImage" runat="server" Width="244px"  />        </td></tr>                       <tr><td align="right">相关描述：</td><td align="left" colspan="3">            <asp:TextBox ID="txtDesc" runat="server" TextMode="MultiLine" Width="600"                 Height="128"></asp:TextBox>        </td></tr>    <tr><td  colspan="4" align="center" >            <asp:Button  ID="btnFriendLink" runat="server" Text="提交"                     onclick="btnFriendLink_Click" />            <asp:Button  ID="btnRestFriendLink" runat="server" Text="重置"                 onclick="btnRestFriendLink_Click"   />        </td></tr></table></form>

    protected void btnFriendLink_Click(object sender, EventArgs e)    {        if (txtName.Text == "" || txtName.Text == null)        {            this.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('单位名称不能为空！');</script>");            return;        }        string message = string.Empty;        string imageSrc = string.Empty;        //图片链接，需要上传        if (ddlType.SelectedValue == "false"||(fileUpImage.FileName!=null&&fileUpImage.FileName!=string.Empty))        {            string imageName = DateTime.Now.ToFileTime().ToString();            if (imageName == "" || imageName == null)            {                this.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('请选择图片！')</script>");                return;            }            string contentType = imageName.Substring(imageName.LastIndexOf(".") + 1);            string folderPath = Server.MapPath("../uploadFile/FriendLink/");            if (!Directory.Exists(folderPath))            {                Directory.CreateDirectory(folderPath);            }             string path = Server.MapPath("../uploadFile/FriendLink/") + imageName;            imageSrc = "uploadFile/FriendLink/" + imageName + "." + fileUpImage.FileName.Substring(fileUpImage.FileName.LastIndexOf(".") + 1); ;            UploadFile.Upload(fileUpImage, path, ref message);        }               FriendsLink upImage = InsertToFriendsLink(imageSrc);        if (upImage == null)        {            this.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加失败！')</script>");            return;        }        else        {            reset();            this.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('添加成功！')</script>");        }            }    private FriendsLink InsertToFriendsLink(string imageSrc) {        FriendsLink friendsLink = new FriendsLink();        friendsLink.Name = StringSub.SubTitle(txtName.Text);        friendsLink.Link = txtLink.Text;        friendsLink.Desc = StringSub.SubDescription(txtDesc.Text.Trim());        friendsLink.ImageSrc = imageSrc;        friendsLink.SortId = Convert.ToInt32(txtSort.Text);        friendsLink.CooperateType = Convert.ToInt32(ddlCooperateType.SelectedValue);        friendsLink.LinkType = Convert.ToBoolean(ddlType.SelectedValue);        return FriendsLinkManager.AddFriendsLink(friendsLink);        }