Folders creating in published application in wwwroot IIS7

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C#

Hi geeks,

Although I tried many times and posted here, but I couldn't solve this problem.
Need to create folders inside my published application which is placed in wwwroot in IIS7. But in vain. Couldn't able to create folders and upload images in published folder.

Did I miss anything ? Also I gave permissions for write in Security menu too .

string root = Server.MapPath("~");
string path = root+"\\Brands\\";
string brandname = addbrand.Text;
bool isExists = System.IO.Directory.Exists(Server.MapPath(@"~/"+path+"/"+brandname));
if (!isExists)
System.IO.Directory.CreateDirectory(Server.MapPath(@"~/" + path + "/" + brandname));
if (uploadimg.HasFile)
{
string FileName = Path.GetFileName(uploadimg.PostedFile.FileName);
uploadimg.SaveAs(@root+"/Images/" + FileName);
}

Thanks in advance
Sriram