public List<SPListItem>  GetItemsContainingValue(SPList list, Guid fieldId, string match)
{
    List<SPListItem> matchingItems =
        (from SPListItem listItem in list.Items
         where
             listItem.Fields.Contains(fieldId) &&
             listItem[fieldId] != null &&
             listItem[fieldId].ToString().Equals(match, StringComparison.InvariantCultureIgnoreCase)
         select listItem).ToList<SPListItem>();
 
    return matchingItems;
}

function togglePeopleEditor(editor, enable) {
    // Disables the control but still allows the user to type into it.
    editor.attr('disabled', enable ? '' : 'disabled');
 
    // Previous control is div element, used to control the textarea control
    var editorDiv = editor.find('textarea').prev();
 
    // When not enabling, ensure text shown in people picker has been resolved, otherwise clear it
    if (!enable) {
        var entityData = editorDiv.find('#divEntityData');
        if (entityData != undefined) {
            if (entityData.attr('isresolved') == undefined || entityData.attr('isresolved') == 'False') {
                editorDiv.html(' ');
            }
        }
        // Hide any error messages
        editor.find('.ms-error').css('display', 'none');
    }
 
    // Hide any errors from view when the people editor is disabled
    if (!enable) {
        editor.find('.ms-error').css('display', 'none');
    }
 
    // Set text colour to Grey so that the control appears disabled in Firefox
    editorDiv.css('color', enable ? 'windowtext' : 'Grey');
    editorDiv.attr('contentEditable', false);
 
    // Ensure all child span elements display correct text colour and disable or enable content editing
    editorDiv.find('span').each(function () {
        $(this).css('color', enable ? 'windowtext' : 'Grey');
        $(this).attr('contentEditable', enable);
    });
 
    // The following will enable or disable the 'Check Name' and 'Browse' links.
    editor.find('a').attr('disabled', enable ? '' : 'disabled').css('cursor', enable ? 'pointer' : 'default');
    // Toggle the child anchor element event handlers
    editor.find('a').each(function () {
        if (enable) {
            if ($(this).attr('onclick') == null)
                this.onclick = $(this).data('onclick_data'); // Restore previously deleted click event
        }
        else {
            if ($(this).data('onclick_data') == undefined)
                $(this).data('onclick_data', this.onclick); // Store click data before removing the current event
            $(this).removeAttr('onclick');
        }
    });
}