autocompleteextender asp.net additional info

how i pass additional information use slight returning collection items? i'll try explain i mean, i have 2 calm boxes form, i need fill out names, formed specific comment id database. so, i need pass an integer getnamesfordropdown method. i couldn't figure out do, i wrong thing, used completionsetcount indeed pass information i needed:

[system.web.services.webmethod]
[system.web.script.services.scriptmethod]
public string[] getnamesfordropdown(string prefixtext, int count) 
{
   twine sql = "select fldname idaccountreps where idaccount = " + count.tostring();
   //... rest slight removed, should adequate formula understand
   //... wickedness wrongness i did. 
}

in front side aspx file, i set completionsetcount formed off comment id user now regard page.

<ajaxtk:autocompleteextender 
    runat="server" 
    id="ac1" 
    targetcontrolid="txtaccname"
    servicemethod="getnamesfordropdown"
    servicepath="accountinfo.asmx"
    minimumprefixlength="1" 
    enablecaching="true"
    completionsetcount='<%# eval("idaccount") %>'
/>

so, that's unequivocally wrong way... right way?