input name and id changes when set runat=server

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This is because you’re using MasterPages.

Controls contained within a content page take on a dynamic ID based on the Master Page hierarchy in order to avoid duplication of IDs.

If you need to reference the control IDs and names in client-side script, you can use <%= first_name.ClientID %>.

If you’re using .NET4 you can use ClientIDMode="Static" to make the generated IDs consistent, although this comes with its own ID-conflict caveats when, for example, using multiple instances of the same user control on a page. Rick Strahl outlines those here.

However, if you’re using ASP.NET validators then everything should be fine. Instead of using an HTML input you should use an ASP.NET TextBox control:

<asp:TextBox id="first_name" runat="server" CssClass="formright" />

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