the remote server returned an error (403) forbidden

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C#

SharePoint2010

hi i try to upload document on sharepoint 2010 site using c#.net but it give me error "the remote server returned an error (403) forbidden"
i use below code for perform this operation:

public void UploadDocument(string siteURL, string documentListName,string documentListURL, string documentName,byte[] documentStream)
        {
            try
            {
                using (ClientContext clientContext = new ClientContext(siteURL))
                {
                    //Get Document List
                    Microsoft.SharePoint.Client.List documentsList = clientContext.Web.Lists.GetByTitle(documentListName);
                    var fileCreationInformation = new FileCreationInformation();
                    //Assign to content byte[] i.e. documentStream
                    fileCreationInformation.Content = documentStream;
                    //Allow owerwrite of document
                    fileCreationInformation.Overwrite = true;
                    //Upload URL
                    System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("i:0#.f|sqlmembers|admin", "admin@!23", "CS-avr-01");
                    ClientContext context = ClaimClientContext.GetAuthenticatedContext(siteURL);
                    fileCreationInformation.Url =documentListName + "//" + documentListURL;
                    Microsoft.SharePoint.Client.File uploadFile = documentsList.RootFolder.Files.Add(
                        fileCreationInformation);
                    //Update the metadata for a field having name "DocType"
                    uploadFile.ListItemAllFields["DocType"] = "Favourites";
                    uploadFile.ListItemAllFields.Update();
                   clientContext.ExecuteQuery();
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
           }          
        }

--so any idea or anything wrong in my code i login on site as a administrator and when i upload document manually it upload successfully but give error when upload using code.
- i try many solution but all time i gate same error.
-any one have any idea about this please help me.
-thank you.