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Q: 

Can I get the DataSource set and Parameters for a sublayout via code-behind?

A: 

1. Set a certain layout and sublayout for an item with Parameters and DataSource:
   
   
2. Publish.
   
3. Use this code-behind code:

1.  Codebehind

using Sitecore;
using Sitecore.Data;
using Sitecore.Data.Items;
using Sitecore.Data.Query;
using Sitecore.Configuration;
using Sitecore.Express;
using Sitecore.Layouts;
using Sitecore.SecurityModel;
using Sitecore.Sites;
….

      protected void GetDataSource_Click(object sender, EventArgs e)
      {
         Database db = Sitecore.Context.Database;
         Item item = db.Items["/sitecore/content/home/Node1"];
         string rend = item.Fields["__renderings"].Value;
         LayoutDefinition layout = LayoutDefinition.Parse(rend);
         DeviceItem dev = Sitecore.Context.Device;
         DeviceDefinition device = layout.GetDevice(dev.ID.ToString());
         Item mySublayout = db.Items["/sitecore/layout/Sublayouts/MySublayout"];
         RenderingDefinition rendering = device.GetRendering(mySublayout.ID.ToString());
         Response.Write("Parameters: " + rendering.Parameters);
         Response.Write("<br/>");
         Response.Write("DataSource: " + rendering.Datasource);
      }