Programmatically add properties to SharePoint site (SPWeb)

Steps Involved:

Open Visual Studio 2010 by going Start | All Programs | Microsoft Visual Studio 2010 | Right click on Microsoft Visual Studio 2010 and click on Run as administrator.
Go to File tab, click on New and then click on Project.
In the New Project dialog box, expand the Visual C# node, and then select the Windows node.
In the Templates pane, select Console Application.
Enter the Name as PropertyBags and then click OK.
In the solution explorer, right click on the solution and then click on Properties.
Select the Application tab, check whether “.Net Framework 3.5” is selected for Target Framework.
Select the Build tab, check whether “Any CPU” is selected for Platform Target.
Add the following references

· Microsoft.SharePoint

Add the following namespaces

· using Microsoft.SharePoint;

Replace Program.cs with the following code

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
 
namespace PropertyBags
{
    class Program
    {
        static void Main(string[] args)
        {
            using (SPSite site = new SPSite("http://serverName:11111/sites/Vijai"))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    web.Properties.Add("_customPropertyKey", "_customPropertyValue");
                    web.Properties.Update();
                    //// Displays the value for _customPropertyKey property
                    Console.WriteLine(web.Properties["_customPropertyKey"]);
                    Console.ReadLine();
                }
            }
        }
    }
}