How to retrieve webpart xml-definition programatically

I have a Custom Webpart deployed in the Site, to which I need to retrieve the XML definition programmatically using Client side object model, can anybody help?

EDIT: I used the following code.

    string strSiteUrl = SiteUrl_txt.Text;
        using (ClientContext cContext = new ClientContext(strSiteUrl))
        {
            //open Web
            Web oWeb = cContext.Web;
            cContext.Load(oWeb);
            File page = oWeb.GetFileByServerRelativeUrl("MySiteUrl");
            LimitedWebPartManager limitedWebPartManager = page.GetLimitedWebPartManager(PersonalizationScope.Shared);
            cContext.Load(limitedWebPartManager, wps => wps.WebParts.Include(wp => wp.WebPart.Properties, wp => wp.WebPart.Title, wp => wp.WebPart.TitleUrl));
            cContext.ExecuteQuery();

            foreach (WebPartDefinition wp in limitedWebPartManager.WebParts)
            {

                if (wp.WebPart.Properties.FieldValues.ContainsKey("UniqueValue"))
                {
                    //  Here I need to extract the XML definition, but not sure what should I 
                    //  add here so that I could get the entire XML definition, like the one 
                    //  we get when we export the webpart as XML in webpart gallery mannually.
                }
            }