While working with SharePoint sites, we can change the regional settings of the site by using user interface and that's easily done.

You can do it like:

Click on Site Actions > Site Settings > Click on Regional Settings link under Site Administration

and this is the small code which you as a developer can use

I have used hard coding here to Initialize Culture Info object but you can do customizations according to your need.

I hope this helps some one.

namespace ChangeCulture

{

class Program

{

static void Main(string[] args)

{

using (SPSite site = new SPSite("http://yoursite"))

{

try

{

using (SPWeb web = site.RootWeb)

{

ChangeCulture(web);

}

}

catch (Exception ex)

{

Console.WriteLine(string.Format("{0}:{1}","Error: ", ex.Message));

}

}

}

private static void ChangeCulture(SPWeb web)

{

if (web != null)

{

web.AllowUnsafeUpdates = true;

//Initialize CultureInfo

CultureInfo ci = new CultureInfo("en-US");

if (ci != null)

{

Console.WriteLine(string.Format("{0}{1}", "Processing ", web.Name));

web.Locale = ci;

web.Update();

}

web.AllowUnsafeUpdates = false;

}

if (web != null)

{

foreach (SPWeb _web in web.Webs)

{

ChangeCulture(_web);

}

}

}

}

}