How to programmatically upload a document in a SPDocumentLibrary

In this post I discussed, how we can programmatically upload a document in a SPDocumentLibrary (SharePoint's document library).

Following method contains the logic to upload the document (codes with comments are self-explainatory).

    /// <summary>
    /// Programmatically UPLoad document in SPDocument Library 
    /// </summary>
    void documentUploadInSPDocumentLibrary()
    {        
        //fileUpload is ASP.Net FileUpload control.
        if (!string.IsNullOrEmpty(fileUpload.FileName))
        {
            SPSite oWebsite = SPContext.Current.Web;
            oWebsite.AllowUnsafeUpdates = true;
            SPDocumentLibrary docLib 
                = oWebsite.Lists["DOCLIB_NAME"] as SPDocumentLibrary;

            //Get file extension ( *.doc OR *.docx )
            string fileExtension 
                = fileUpload.FileName.Substring(fileUpload.FileName.IndexOf("."));
            byte[] fileBytes = fileUpload.FileBytes;
            string destUrl 
                = docLib.RootFolder.Url + "/" + "MyFileName" + fileExtension;
            SPFile destFile = docLib.RootFolder.Files.Add(destUrl, fileBytes, true);
            destFile.Update();

            oWebsite.AllowUnsafeUpdates = true;
        }
    }