c# - using QueryString in ASPX file -

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i trying use sql command in aspx file capture querysring value having syntax issue. works fine when try filter querystring syntax issue. how can filter query using querystring? here code:

<asp:sqldatasource id="dd_ai_ds" runat="server"                connectionstring="<%$ connectionstrings:myconnectionstring %>"                selectcommand="select distinct [myfield] [mytable] id = '"+request.querystring[id]+"' order id asc" >           </asp:sqldatasource>

try instead:

<asp:sqldatasource id="dd_ai_ds" runat="server"     connectionstring="<%$ connectionstrings:myconnectionstring %>"     selectcommand="select distinct [myfield] [mytable] id = @id order id asc" >    <selectparameters>     <asp:querystringparameter name="id" querystringfield="post_id" type="string" />    </selectparameters> </asp:sqldatasource>

as aside, if code had written had worked have created security hole in website allowing sql injection. read on topic don't accidentally make websites open hackers.


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