如何在ImageButton OnClick后面的代码中实现if else条件

I am working on my website design and have already implemented a simple slideshow consisting of image buttons that would redirect users to different pages when they click on them. However the issue that I've noticed is that all of the images redirect users to the same page and I realized it was due to all the Images in the slideshow inheriting the method Response.Redirect("url")...then I tried to use an if else condition for example I am working on my website design and have alre