C#下拉多选，多选下拉CheckBoxList的DropDownList

.Default { font-size:smaller; font-family:Tahoma; } table { padding:0px; border-collapse:collapse; } .DropDownLook { padding:0px; border-style:solid; border-width:1px; } .DivClose { display:none; position:absolute; width:250px; height:220px; border-style:solid; border-color:Gray; border-width:1px; background-color:#99A479; } .LabelClose { vertical-align:text-top; position:absolute; bottom:0px; font-family:Verdana; } .DivCheckBoxList { display:none; background-color:White; width:250px; position:absolute; height:200px; overflow-y:auto; overflow-x:hidden; border-style:solid; border-color:Gray; border-width:1px; } .CheckBoxList { position:relative; width:250px; height:10px; overflow:scroll; font-size:small; }