Upload File in SharePoint Libary

private bool UploadFileToLibrary(string FileName)
{

    string filePath = "Locafilepath";  //"c:\filetobeuploaded"
    string siteURL = SPContext.Current.Web.Url;
    string libraryName = "DocumentLibraryName";   //internal name
    SPFile spFile;

    try
    {
        using (SPSite oSite = new SPSite(SPContext.Current.Web.Url))
        {
            using (SPWeb oWeb = oSite.OpenWeb())
            {
                filePath = filePath.Trim()+FileName.Trim();
                if (!System.IO.File.Exists(filePath))
                { throw new FileNotFoundException("File not found.", filePath);
                }

                 // SPFolder libFolder = oWeb.GetList(libraryName).RootFolder;
                SPFolder libFolder = oWeb.Folders[libraryName];

                // Prepare to upload

               // string fileName = System.IO.Path.GetFileName(filePath);

                FileStream fileStream = File.OpenRead(filePath);

                //Check the existing File out if the Library Requires CheckOut
                if (libFolder.RequiresCheckout)
                {
                    string fileUrl = string.Format("{0}/{1}/{2}", oWeb.Url, libraryName, FileName);
                    spFile = oWeb.GetFile(fileUrl);
                    if (spFile.Exists)
                   //spFile = libFolder.Files[fileName];
                    if (spFile != null)
                    { spFile.CheckOut(); }


                }

                // Upload document
                SPFile spfile = libFolder.Files.Add(FileName, fileStream, true);
                // Commit
                libFolder.Update();
                //Check the File in and Publish a Major Version
                if (libFolder.RequiresCheckout)
                {
                    spFile = libFolder.Files[FileName];
                    spFile.CheckIn("Upload Comment", SPCheckinType.MajorCheckIn);
                    //spFile.Publish("Publish Comment");

                }


            }
        }
    }
    catch (Exception ex)
    {
       }


    return true;
}