unauthorized access exception Access to the path 'C:\afthab marg.jpg' is denied.

protected void Button1_Click(object sender, EventArgs e)



    {
        if (FileUpload1.PostedFile != null)
        {
            String filename = FileUpload1.PostedFile.FileName;// from here we can get the name of the file we have to upload
            FileUpload1.PostedFile.SaveAs("C:\\"+ filename);// here we have to get the location of the file 

        }
    }