<asp:FileUpload ID="FileUpload1" runat="server" />&nbsp;
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" Width="47px" />
        <asp:Image ID="Image1" runat="server" Visible="false" /></div>

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一搜一大把
http://www.cnblogs.com/outman2008/archive/2006/01/07/312823.html
http://www.cnblogs.com/overred/archive/2006/05/06/392881.html
http://pw.cnblogs.com/archive/2006/05/24/408427.html
http://dev.yesky.com/msdn/304/2413804.shtml
http://dotnet.aspx.cc/article/58ea3515-36f2-4fd9-ac89-eaf49f59816c/read.aspx(孟子)
http://blog.joycode.com/saucer/posts/16225.aspx

------解决方案--------------------
探讨

HTML code  <asp:FileUpload ID="FileUpload1" runat="server" />&nbsp;
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" Width="47px" />
        <asp:Image ID="Image1" runat="server" Visible="false" /></div>





C# code protected void Button1_Click(object sender, EventArgs e)
        {
            if (this.FileUpload1.PostedFile.ContentLength == 0) retur…


------解决方案--------------------
探讨

好，收下了，多谢各位