How to hide new site option in feature is activated event

Question

How to hide new site option in feature is activated event. when feature is deactivated it will visible to users

Answer 1

You can add following custom action:

<CustomAction
    Id="HideCreateSiteInSiteActions"
    Location="Microsoft.SharePoint.StandardMenu"
    GroupId="SiteActions"
    Sequence="901"
    Title="Publishing SiteActions Menu Customization"
    ControlAssembly="Your Assembly full name"        ControlClass="your class full name">

And following code in the Class file:

public class YourClassName : WebControl
{
    protected override void OnLoad(EventArgs e)
    {
        var siteActions = ToolBarMenuButton.GetMenuControl(this);
        siteActions.MenuControl.PreRender += (o, args) =>
        {
            var targetMenu = siteActions.GetMenuItem("MenuItem_CreateSite");
            if (targetMenu == null) return;
            siteActions.MenuControl.HiddenMenuItems.Add(targetMenu);
        };
    }        
}

Reference link here