C# to create a Sandbox Solution WebPart for SharePoint Online

SharePoint Online development options http://msdn.microsoft.com/

1. Open Microsoft Visual Studio 2010--> New Project --> Create a empty sharePoint Project-->

 Choose trust level as a Sandbox solution

 

5.  Now click on Solution Explorer

6. Add new item --> Add new WebPart

8. Write simple code for class

using System;

using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

namespace GodBlessUsWebPart.GodBlessUsWebPart
{
    [ToolboxItemAttribute(false)]
    public class GodBlessUsWebPart : WebPart
    {
        protected override void CreateChildControls()
        {
            Table tb = new Table();
            this.Controls.Add(tb);
            TableRow tbRow = new TableRow();
            tb.Rows.Add(tbRow);
            TableCell tbCell = new TableCell();
            tbRow.Cells.Add(tbCell);
            Label lbHello = new Label();
            tbCell.Controls.Add(lbHello);
            lbHello.Text = "Hello there, God bless us! Chào bạn, Thiên Chúa chúc phúc cho bạn! Bonjour à tous, Dieu nous bénisse!";
        }
    }
}

9. Rebuild project

10. Package project

11. Get GodBlessUsWebPart.wsp from debug folder of solution folder structure

12. Now go to Your Site --> Click on Site Setting --> Click Solutions under galleries

14. Click on Browse

15. Click back on Solutions

16. Click on Upload Solution

17. Click on Browse...

18. Choose  GodBlessUsWebPart.wsp to upload

19. Click OK to Upload

20. Click on Activate to active solution GodBlessUsWebPart

21. GodBlessUsWebPart solution already to use

22. Edit a page

23. Click Insert

24. Click on More Web Parts

25. Click on GodBlessUsWebPart then click Add

26. Exceeded daily resource usage quota

27. We must wait until the resource usage quota available for the site collection or can be add the webPart to another site collection to use (Chúng ta phải đợi cho đến khi có hạn mức sử dụng mới với site collection này hay có thể add GodBlessWebPart solution này vào một site collection khác để sử dụng)

28. The GodBlessUsWebPart look like

Dowload Solution file: GodBlessUsWebPart.wsp
Download source cod: GodBlessUsWebPart.zip

Sandboxed solution development in SharePoint Online http://msdn.microsoft.com/

SharePoint client object model architecture  http://msdn.microsoft.com/