Hi pranjal,

you can hook into the events of the ContentType:

https://our.umbraco.org/documentation/reference/events/ContentTypeService-Events

The one you should use is the SavingContentType where you then can do your checks.

Code example:

public class YourCustomEvents: ApplicationEventHandler
{
    // Fired when application is started
    protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {       
        ContentTypeService.SavingContentType += ContentTypeService_SavingContentType;
    }

    private void ContentTypeService_SavingContentType(IContentTypeService sender, Umbraco.Core.Events.SaveEventArgs<Umbraco.Core.Models.IContentType> e)
    {
        // Do your checks
    }
}

Hope this helps!

/Michaël