public IActionResult Update(string exampleId, Example exampleToUpdate)
 {
     if (exampleToUpdate == null)
     {
         return(BadRequest(ModelState));
     }
     if (exampleId != exampleToUpdate.Id)
     {
         return(BadRequest(ModelState));
     }
     if (!exampleRepository.ExampleExists(exampleId))
     {
         return(NotFound());
     }
     if (!ModelState.IsValid)
     {
         return(BadRequest(ModelState));
     }
     if (!exampleRepository.Update(exampleToUpdate))
     {
         ModelState.AddModelError("", "Update Error");
         return(StatusCode(500));
     }
     return(Ok("Update Success"));
 }