How do I redirect a user when a button is clicked?

It depends on what you mean by button. If it is a link:

<%= Html.ActionLink("some text", "actionName", "controllerName") %>

For posting you could use a form:

<% using(Html.BeginForm("actionName", "controllerName")) { %>
    <input type="submit" value="Some text" />
<% } %>

And finally if you have a button:

<input type="button" value="Some text" onclick="window.location.href='<%= Url.Action("actionName", "controllerName") %>';" />

Just as an addition to the other answers, here is the razor engine syntax:

<input type="button" value="Some text" onclick="@("window.location.href='" + @Url.Action("actionName", "controllerName") + "'");" />

window.location.href = '@Url.Action("actionName", "controllerName")';

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