如何在asp按钮上禁用回发

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return false;" />

protected void Button1_Click(object sender, EventArgs e)
{
    Button1.UseSubmitBehavior = false;
    ClientScript.RegisterStartupScript(this.GetType(), "disablePostback",<script>document.getElementById('" + Button1.ClientID + "').onclick = function() { return false; }</script>");
}