Question : OnClientClick Needs PostBack

I have a linkButton that needs to perform serverside stuff.

But i want to prevent user from clicking more than once.

When I disable the button with javascript, the postback is cancelled.

i want both, disable and postback.

see attached snippets 
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default.aspx
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
      .style100
      {
        width: 100%;
      }
      .style20
      {
        width: 20%;
      }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <table class="style100">
      <tr class="style100">
        <td class="style20">&nbsp;</td>
        <td class="style20">
          &nbsp;</td>
        <td class="style20">
          &nbsp;</td>
        <td class="style20">
          &nbsp;</td>
        <td class="style20">&nbsp;</td>
      </tr>
      <tr class="style100">
        <td class="style20">
          <asp:LinkButton 
                    ID="lbBuildProjection" 
                    runat="server" 
                    onclick="lbBuildProjection_Click" 
                    Text="Build Projections" 
                    ToolTip="Project Targeting $" 
                    OnClientClick="AllowClickOnce('lbBuildProjection')"
                    ></asp:LinkButton>
                    </td>
        <td class="style20">
          <asp:CheckBox ID="cbBuildProjection" runat="server" Text="Enabled" />
        </td>
        <td class="style20">
          <asp:Label ID="lblBuildProjections" runat="server"></asp:Label>
        </td>
        <td class="style20">
          <asp:Button ID="btnReEnable" runat="server" onclick="btnReEnable_Click" Text="btnReEnable" />
        </td>
        <td class="style20">&nbsp;</td>
      </tr>
      <tr class="style100">
        <td class="style20">&nbsp;</td>
        <td class="style20">
          &nbsp;</td>
        <td class="style20">&nbsp;</td>
        <td class="style20">&nbsp;</td>
        <td class="style20">&nbsp;</td>
      </tr>
      </table>
    <div>
    
    </div>
    </form>
    <script src = "AgmaJScript.js" type = "text/jscript" ></script>
</body>
</html>

default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        cbBuildProjection.Checked = lbBuildProjection.Enabled;
        lblBuildProjections.Text = "Open";
    }
    protected void btnReEnable_Click(object sender, EventArgs e)
    {
        lbBuildProjection.Enabled = true;
        lblBuildProjections.Text = "Open";
    }
    protected void lbBuildProjection_Click(object sender, EventArgs e)
    {
        cbBuildProjection.Checked = lbBuildProjection.Enabled;
        lblBuildProjections.Text = "Clicked";
    }
}


Javascript 
AgmaJScript.js.js
function AllowClickOnce(ctl) {
    javascript:
    var linkbutton = document.getElementById(ctl);
    if (linkbutton.disabled != true) {
        linkbutton.disabled = true;
        return true;
    }
    else {
        return false;
    }
}

Answer : OnClientClick Needs PostBack

1. Free range grazing is land intensive (needs lots of space).

2. Requires herding, which is expensive.

3. Uneven diet would affect the quality of milk.

I am sure I can list another 6 reasons why it is impractical.
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