Sitecore Detect Page Editor C#

sitecorePageModes.cs

if (Sitecore.Context.PageMode.IsPageEditor) 
{
  // capture all page modes
}
//  detailed page modes which could be handy for different editor types
if (Sitecore.Context.PageMode.IsPageEditorEditing)
{
  // specific if using the experience editor
  // handy for content editors who only edit content and don't make structural changes to the page
}
if (Sitecore.Context.PageMode.IsPreview) 
{
  // specific if using the preview mode
}
if (Sitecore.Context.PageMode.IsPageEditorDesigning) 
{
  // specific if using the design mode
  // this can be really handy for non-content editors and someone who constructs the page 
  // and need to see all the functionality 
}

if (Sitecore.Content.PageMode.IsPageEditorNavigating) 
{
  // general clicking around the site in page editor mode
}