asp.net - setting width of select box of asp dropdownlist -

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i have gone through similar questions (answers) asked before. not have need. need width of drop down constant time. when drops down & items wider width. wider items should displayed tooltip. how do this? , deal select element? why every post have answers in terms of "select". using asp dropdown. how use select it? anyway, here's css ddl:

.ddl2 { margin-top: 10px; margin-bottom: 10px; border-style: solid; border-width: thin; border-color: gray; height: 20px; max-width: 150px; }

this works (only in firefox) when nothing selected. ddl drops, selectbox takes width of widest element.

edit:

   try         {              dataset dscountry = objbindddl.binddropdownlisttoacountry();             ddlcountry.datasource = dscountry.tables["acountry"];             ddlcountry.datatextfield = "countryname";             ddlcountry.datavaluefield = "id";             ddlcountry.databind();             ddlcountry.items.insert(0, new listitem("please select country", ""));         }


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