列表以检查asp.net中的复选框列表中的项目

Question

I have a checkboxlist which I have bind with database in which there are around 9000 items , some of them are selected.I have list in which I have 5000 items.I have to check these 5000 items in checkboxlist and remaining unchecked. Please suggest optimized way.

What I try

foreach (var eachName in Namelist)
            {
                foreach (ListItem eachCblNameItem in cblName.Items)
                {
                    if (eachCblNameItem.Value == eachName)
                    {
                        eachCblNameItem.Selected = true;
                    }
                    else
                    {
                        eachCblNameItem.Selected = false;
                    }

                }

            }

Answer 1

Just an idea as (linq) pseudo-code:

var itemsSelected = from item in checkBoxList.Items
                    join dbItem in database.SelectedItems
                      on item.UniqueKey equals dbItem.UniqueKey
                    select item;

foreach( var item in itemsSelected )
{
    item.Selected = true;
}