判断上传图片大小的问题？

[chenjing1104]

protected void btnUpload_Click(object sender, EventArgs e)
{
if(file.PostedFile.FileName !="")
{
string name = file.FileName;
string type = name.Substring(name.LastIndexOf(".") + 1);
string extension = name.Substring(name.LastIndexOf("."));
string ipath = Server.MapPath("Images") + "\\" + name;
string wpath = "images\\" + name;
//string query = "insert into data (wpath) values('"+ wpath +"')";
if (type == "jpg" || type == "gif" || type == "bmp" || type == "png")
{
file.SaveAs(ipath);
//SQLServerDAL.DbHelperSQL.ExecuteSqlInsertImg(query);
this.placeholder.Src = "images\\" + name;
lblFile.Text = "上传成功！";
}

else if (type != "jpg" || type != "gif" || type != "bmp" || type != "png")
{
lblFile.Text = "上传图片的格式不正确，请重新选择！";
return;
}
else if(this.file.PostedFile.ContentLength > 10 * 1024)
{
lblFile.Text = "图片大小不能超过10KB,请重新选择！";
return;
}
}
}

就是这个判断图片的大小，不知道是那里的问题，也调试了的，不管上传多大的图片都可以上传成功，还请高手帮忙看，在线，谢谢！

[zhong2006]

顺序问题，
把代码调整一下
protected void btnUpload_Click(object sender, EventArgs e)
{
if(file.PostedFile.FileName !="")
{
string name = file.FileName;
string type = name.Substring(name.LastIndexOf(".") + 1);
string extension = name.Substring(name.LastIndexOf("."));
string ipath = Server.MapPath("Images") + "\\" + name;
string wpath = "images\\" + name;
//string query = "insert into data (wpath) values('"+ wpath +"')";
if(this.file.PostedFile.ContentLength > 10 * 1024)
{
lblFile.Text = "图片大小不能超过10KB,请重新选择！";
return;
}
if (type == "jpg" || type == "gif" || type == "bmp" || type == "png")
{
file.SaveAs(ipath);
//SQLServerDAL.DbHelperSQL.ExecuteSqlInsertImg(query);
this.placeholder.Src = "images\\" + name;
lblFile.Text = "上传成功！";
}
else
{
lblFile.Text = "上传图片的格式不正确，请重新选择！";
return;
}
}
}

[别递烟哥不会]

很明显里面的if块的嵌套有问题，如果类型对的话，根本执行不到下面的判断大小那块

[chenjing1104]

谢谢啦！