为什么上传不了图片到文件夹？

[password636]

要把一个图片上传到UpFile文件夹，是文件夹的共享设置还是什么问题？代码如下，哪位给看看如何改？
private void btn_PostUp_Click(object sender, System.EventArgs e)
{
string Path;
string FileName;
int Po;
long FileSize;
string fType;
if(File1.PostedFile.FileName.Trim()!="")
{
try
{
Path=Server.MapPath("\\BookShop\\UpFile").ToString();
FileName=File1.PostedFile.FileName.ToString();
fType=File1.PostedFile.ContentType;
FileSize=File1.PostedFile.ContentLength;
if(fType.Substring(0,5)!="image")
{
ShowErrMsg("PostFile is not Image!");
return;
}
Po=FileName.LastIndexOf((char)92);
FileName=FileName.Substring(Po+1,FileName.Length -Po-1);
ViewState["PostFileName"]=FileName;
File1.PostedFile.SaveAs(Path+"\\"+FileName);
img_BookImg.ImageUrl="UpFile\\"+FileName;
}
catch(Exception er)
{
ShowErrMsg(er.Message);
}
}
}

[password636]

这个比较好看些
private void btn_PostUp_Click(object sender, System.EventArgs e)
{
string Path;
string FileName;
int Po;
long FileSize;
string fType;
if(File1.PostedFile.FileName.Trim()!="")
{
try
{
Path=Server.MapPath("\\BookShop\\UpFile").ToString();
FileName=File1.PostedFile.FileName.ToString();
fType=File1.PostedFile.ContentType;
FileSize=File1.PostedFile.ContentLength;
if(fType.Substring(0,5)!="image")
{
ShowErrMsg("PostFile is not Image!");
return;
}
Po=FileName.LastIndexOf((char)92);
FileName=FileName.Substring(Po+1,FileName.Length -Po-1);
ViewState["PostFileName"]=FileName;
File1.PostedFile.SaveAs(Path+"\\"+FileName);
img_BookImg.ImageUrl="UpFile\\"+FileName;
}
catch(Exception er)
{
ShowErrMsg(er.Message);
}
}
}

[zyw2833]

Server.MapPath("BookShop/UpFile")//虚拟路径