How to get values of selected items in CheckBoxList with foreach in ASP NET C

Question

I have a CheckBoxList like this    lt asp CheckBoxList ID  CBLGold  runat  server  CssClass  cbl  gt       lt asp ListItem Value  TGJU  gt  TG  lt  asp ListItem gt       lt asp ListItem Value  GOLDOZ  gt  Gold  lt  asp ListItem gt       lt asp ListItem Value  SILVEROZ  gt  Silver  lt  asp ListItem gt       lt asp ListItem Value  NERKH  gt  NE  lt  asp ListItem gt       lt asp ListItem Value  TALA  gt  Tala  lt  asp ListItem gt       lt asp ListItem Value  YARAN  gt  Sekeh  lt  asp ListItem gt   lt  asp CheckBoxList gt    Now I want to get the value of the selected items from this CheckBoxList using foreach  and put the values into a list

User · Answer

List lt string gt  values  new list lt string gt     foreach ListItem Item in ChkList Item        if Item Selected      values Add item Value

User · Answer

string s  string Empty  for  int i   0  i  lt  Chkboxlist Items Count  i            if  Chkboxlist Items i  Selected                s   Chkboxlist Items i  Value

User · Answer

If you have a databound checklistbox it does not work to get item j  Selected  because the control does not have a selected attribute  If you clearSelections i e  on Load  then apparently it now understands item j  selected

User · Answer

To top up on  Tim Schmelter  in which to get back the List lt int gt  instead   List lt string gt  selectedValues   CBLGold Items Cast lt ListItem gt        Where li   gt  li Selected      Select li   gt  li Value      Select int Parse      ToList

User · Answer

Following suit from the suggestions here  I added an extension method to return a list of the selected items using LINQ for any type that Inherits from System Web UI WebControls ListControl    Every ListControl object has an Items property of type ListItemCollection   ListItemCollection exposes a collection of ListItems  each of which have a Selected property   C Sharp   public static IEnumerable lt ListItem gt  GetSelectedItems this ListControl checkBoxList        return from ListItem li in checkBoxList Items where li Selected select li      Visual Basic    lt Extension   gt    Public Function GetSelectedItems ByVal checkBoxList As ListControl  As IEnumerable Of ListItem      Return From li As ListItem In checkBoxList Items Where li Selected End Function   Then  just use like this in either language   myCheckBoxList GetSelectedItems

User · Answer

In my codebehind i created a checkboxlist from sql db in my Page Load event and in my button click event did all the get values from checkboxlist etc    So when i checked some checkboxes and then clicked my button the first thing that happend was that my page load event recreated the checkboxlist thus not having any boxes checked when it ran my get checkbox values     I ve missed to add in the page load event the if   this IsPostBack   protected void Page Load object sender  EventArgs e       if   this IsPostBack                db query and create checkboxlist and other       SqlConnection dbConn   new SqlConnection WebConfigurationManager ConnectionStrings  ConnString   ConnectionString         string query        try                 query    SELECT  name    mail  FROM  users            dbConn Open            SqlDataAdapter da   new SqlDataAdapter query  dbConn           DataSet ds   new DataSet            da Fill ds           if  ds Tables 0  Rows Count    0                      checkboxlist1 DataSource   ds            checkboxlist1 DataTextField    name             checkboxlist1 DataValueField    mail             checkboxlist1 DataBind                      else                     Response Write  No Results found                              catch  Exception ex                     Response Write   lt br gt     ex                   finally                    dbConn Close                     protected void btnSend Click object sender  EventArgs e        string strChkBox   string Empty     foreach  ListItem li in checkboxlist1 Value              if  li Selected    true                    strChkBox    li Value                         use only   strChkBox    li           if you want the name of each checkbox checked rather then it s value                    Response Write strChkBox        And the output was as expected  a semicolon separeted list for me to use in a mailsend function       bill contoso com  jeff corp inc  sam dot net   A long answer to a small problem  Please note that i m far from an expert at this and know that there are better solutions then this but it might help out for some

User · Answer

Just in case you want to store the selected values in single column seperated by   then you can use below approach string selectedItems   String Join  quot   quot   CBLGold Items OfType lt ListItem gt    Where r   gt  r Selected  Select r   gt  r Value     if you want to store Text not values then Change the r Value to r Text

User · Answer

Note that I prefer the code to be short  List lt ListItem gt  selected   CBLGold Items Cast lt ListItem gt         Where li   gt  li Selected       ToList     or with a simple foreach  List lt ListItem gt  selected   new List lt ListItem gt     foreach  ListItem item in CBLGold Items      if  item Selected  selected Add item    If you just want the ListItem Value  List lt string gt  selectedValues   CBLGold Items Cast lt ListItem gt        Where li   gt  li Selected      Select li   gt  li Value      ToList

User · Answer

I like to use this simple method to get the selected values and join them into a string private string JoinCBLSelectedValues CheckBoxList cbl  string separator    quot  quot         return string Join separator  cbl Items Cast lt ListItem gt    Where li   gt  li Selected  ToList

User · Answer

foreach  ListItem item in CBLGold Items        if  item Selected                string selectedValue   item Value

User · Answer

Good afternoon  you could always use a little LINQ to get the selected list items and then do what you want with the results   var selected   CBLGold Items Cast lt ListItem gt    Where x   gt  x Selected      work with selected

[c#] How to get values of selected items in CheckBoxList with foreach in ASP.NET C#?

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