how to set users rights in asp.net

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C#2.0

C#

VB

ASP.NET

i have to set user rights in my application
In my application there are 3 user Admin,user1,User2.
For menu i have CSS file.

For User 1 i have to show 3 forms acc_master,StateMaster and sales form
For User 2 i have to show 2 forms dispatch form,and enquiry form.
for admin all forms to be shown

I have to set all this with single CSS file.

my css file is as follow

<ul id="css3menu3" class="topmenu" style="width: 968px">
<li class="topmenu" style="width: 160px"><a href="#" title="Master Maintenance">
	<span> Master Maintenance</span></a>
	<ul>
		<li class="subfirst"><a href="#" title="Account Master"><span>Account Master</span></a>
		<ul>
			<li class="sublast"><a href="../FormDetails/AccountLedger.aspx" title="Account Ledger">Account Ledger</a></li>
		</ul>
		</li>
		<li class="sublast"><a href="#" title="Product Master"><span>Product Master</span></a>
		<ul>
			<li class="subfirst"><a href="GroupMaster.aspx" title="Group Master">Group Master</a></li>
			<li><a href="StateMaster.aspx" title="UOM/State Master">UOM/State Master</a></li>
			<li><a href="ProductMaster.aspx" title="Product Details">Product Details</a></li>
</ul></li>
		</ul>
		</li>
		<li class="sublast"><a href="#" title="Sales/Expense Tax Master"><span>Sales/Expense Tax Master</span></a>
		<ul>
			<li class="subfirst"><a href="TaxMaster.aspx" title="Product Group">Tax Master</a></li>	
		</ul>
		    <li class="sublast"><a href="CompanyMaster.aspx" title="Company Master"><span>Company Master</span></a>
		</li>
	</li></ul>
	
	<li class="topmenu" style="width: 160px"><a href="#" title="Daily Entry">   
           Daily Entry<span></span></a>
	<ul>
		<li class="sublast"><a href="SalesOrder.aspx" title="Sales Order">Sales Order</a></li>
	<li class="sublast"><a href="DispatchOrder.aspx" title="Dispatch Order">Dispatch Order</a></li>
	
	</ul>
	</li>
	    
	
	<li class="topmenu" style="width: 160px"><a href="#" title="Exit" önclick="closeMe();">Exit</a></li>