Selenium C＃：执行正确的jQuery

Question

Im trying to execute jquery from selenium to change the visibility of a object, I have the next code but it's not working, does anybody knows the error?

IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
        js.ExecuteScript(                
           "document.querySelector('input[type='file']').style.display = 'block';"
         );

Answer 1

The problem were the quotes, I've already fixed:

IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
        js.ExecuteScript(
         @"document.querySelector('input[type=""file""]').style.display = 'block';"

            );