Prevent an Asp.Net Button from triggering a Postback

Sometimes, you want an Asp.net Button to not trigger a postback.

One solution is, don't use an asp.net button, use an html input or link tag instead. However, you may want to use an asp:XXXButton for consistency with the rest of your page; or it may seem a simple way to make the text on the button localisable (although you can equally achieve that on a plain old html control if you give it an id, a runat="server" and probably a meta:resourcekey); or you may have other stuff you want to do with it serverside.

To stop an asp.net button causing a postback, do it like this:

<asp:LinkButton id="btnX" OnClientClick="return false;" runat="server" />

The more likely scenarios is, that you want to run clientside javascript. In that case, put ";return false;" after your javascript call:

<asp:LinkButton id="btnX" OnClientClick="functionToCall();return false;" runat="server"/>