最简单的上传图片代码

.aspx
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="f1" runat="server" />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</div>
</form>

.aspx.cs

protected void Button1_Click(object sender, EventArgs e)
{
if (f1.FileName != "")
{
string file = f1.FileName; //得到文件名
f1.PostedFile.SaveAs(Server.MapPath("upfile/" + file)); //上传图片
Response.Write("<img src="upfile/" mce_src="upfile"" + file + " />");//输出图片
}
}