How add file is document of sharepoint use the webpart

Question

Hi all.
I want file upaload in sharepoint's document use my Webpart.
this is my source
protected void Button1_Click(object sender, EventArgs e)
            using (SPSite site = new SPSite("http://nar-cla500s3:12345/sites/qa"))
                using (SPWeb web = site.AllWebs[""])
                    string filepath = @"C:\Users\lx13040020\Desktop\test.xlsx";            
                    FileStream filestream = File.OpenRead(filepath); <-- error access denied
                    SPFile file = web.Folders["QADocument"].Files.Add(filepath, filestream, true);                
But I have error "access denied".
I referd to this link
(SPFile ex)
http://stackoverflow.com/questions/468469/how-do-you-upload-a-file-to-a-document-library-in-sharepoint
(Filestream Access denied)
http://stackoverflow.com/questions/7706467/access-to-the-path-denied-error-in-c-sharp
But i could not solve my problem.
please teach me, Wait for your help. Thank you

Answer 1

hi
I assume that in site.AllWebs[""] in your real code you use correct site-relative url of the SPWeb? If yes, then you need to ensure that account under which code is executed has access to the "C:\Users\lx13040020\Desktop" folder. The simplest way to do it
to execute your code under SPSecurity.RunWithElevatedPriveleges() (in this case you will know that code is executed under account of application pool) and give permissions to account of application pool for the mentioned path:
protected void Button1_Click(object sender, EventArgs e)
SPSecurity.RunWithElevatedPriveleges(() =>
using (SPSite site = new SPSite("http://nar-cla500s3:12345/sites/qa/test"))
using (SPWeb web = site.OpenWeb())
string filepath = @"C:\Users\lx13040020\Desktop\test.xlsx";
FileStream filestream = File.OpenRead(filepath); <-- error access denied
SPFile file = web.Folders["QADocument"].Files.Add(filepath, filestream, true);
Note that in this example I used SPWeb url in constructor of SPSite object and then SPSite.OpenWeb() which will give the same result.
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