The actionlink would be rather comparable to Hyperlinkbutton or Hyperlink controls in webforms. They all render a standard anchor element in html. So yes if you want to make it look like a button you should add some css sauce on top of it.
<%: Html.ActionLink("MyAction", "MyAction", null, new { @class = "button" } %>
and in the css file:
.button {
outline: 0;
margin: 0 4px 0 0;
padding: 0 1em;
height: 2em;
text-decoration: none !important;
cursor: pointer;
position: relative;
text-align: center;
display: inline-block;
background-color:Green;
border:1px solid Lime;
}
a.button { color:White;}
Note: I'm a developer so somewhat design challenged. Playing around with border-left, -right, -bottom and -top you can make it look nicer.
Update after the first comment:
Other alternatives, which don't look that nice to me, are:
<% Using (Html.BeginForm("About", "Home")) {%>
<input type="submit" value="About" />
<% } %>
Or with the Button control:
<form id="Form1" runat="server">
<asp:Button runat="server" ID="sfsf" Text ="Go!" PostBackUrl="/Home/About" />
</form>