C# code to create and Update list Views Programmatically in SharePoint 2010

using (SPSite oSPsite = new SPSite("http://MyWebSiteURL/"))

{

    oSPsite.AllowUnsafeUpdates = true;

    using (SPWeb oSPWeb = oSPsite.OpenWeb())

    {

        oSPWeb.AllowUnsafeUpdates = true;

        /* get the list instance by list name */

        SPList list = oSPWeb.Lists["List_Name"];

        /* ======== Part I (create a view) ======== */

        // add the field names to the string collection

        StringCollection strViewFields = new StringCollection();

        strViewFields.Add("FullName");

        strViewFields.Add("Address");

        strViewFields.Add("City");

        strViewFields.Add("State");

        // create a standard view with the set of fields defined in the collection

        list.Views.Add("View_Name", strViewFields, String.Empty,

            100, true, false, SPViewCollection.SPViewType.Html, false);

        /* ==== End Part I ==== */

        /* ==== Part II (add fields to an existing view) ==== */

        // get the view instance by view display name

        SPView view = list.Views["Existing_View_Name"];

        // add fields to the view

        view.ViewFields.Add("Zip");

        view.ViewFields.Add("Country");

        // update view for new fields

        view.Update();

        /* ==== End Part II ==== */
 

        /* update the list */

        list.Update();

        oSPWeb.AllowUnsafeUpdates = false;

    }

    oSPsite.AllowUnsafeUpdates = false;

}