ASP.NET中的图片上传

protected void Button3_Click(object sender, EventArgs e)
    {
        //定义变量,判断是否有图片上传
        bool fileIsValid = false;
        //如果有图片上传,判断其格式
        if (this.FileUpload1.HasFile)
        {
            int len = this.FileUpload1.PostedFile.ContentLength;
            if (len / 1024 > 60)
            {
                this.Label1.Text = "图片太大了";
                return;
            }
            else
            {
                string type = this.FileUpload1.PostedFile.ContentType;
                if (type == "image/pjpeg")
                {
                    fileIsValid = true;
                }
                else
                {
             &nbs