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

Question

I have a CheckBoxList like this:

<asp:CheckBoxList ID="CBLGold" runat="server" CssClass="cbl">
    <asp:ListItem Value="TGJU"> TG </asp:ListItem>
    <asp:ListItem Value="GOLDOZ"> Gold </asp:ListItem>
    <asp:ListItem Value="SILVEROZ"> Silver </asp:ListItem>
    <asp:ListItem Value="NERKH"> NE </asp:ListItem>
    <asp:ListItem Value="TALA"> Tala </asp:ListItem>
    <asp:ListItem Value="YARAN"> Sekeh </asp:ListItem>
</asp:CheckBoxList>

Now I want to get the value of the selected items from this CheckBoxList using foreach, and put the values into a list.

http://stackoverflow.com/questions/9523263/how-can-i-get-the-checkboxlist-selected-values-what-i-have-doesnt-seem-to-work — dotalchemy, Sep 20 '13 at 19:13

score 209 · Accepted Answer · edited Sep 03 '20 at 15:10

209

Note that I prefer the code to be short.

List<ListItem> selected = CBLGold.Items.Cast<ListItem>()
    .Where(li => li.Selected)
    .ToList();

or with a simple foreach:

List<ListItem> selected = new List<ListItem>();
foreach (ListItem item in CBLGold.Items)
    if (item.Selected) selected.Add(item);

If you just want the ListItem.Value:

List<string> selectedValues = CBLGold.Items.Cast<ListItem>()
   .Where(li => li.Selected)
   .Select(li => li.Value)
   .ToList();

edited Sep 03 '20 at 15:10

TylerH

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answered Sep 20 '13 at 19:12

Tim Schmelter

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@نرخیاب: edited my answer to show how to select only the values. `var` is just a shortcut for `List`. – Tim Schmelter Sep 20 '13 at 19:19
1

If you get an error that .Cast is not a method on the ListItemCollection, you'll need to add a reference: "using System.Linq;" – Peter Jacoby Aug 11 '15 at 14:49
1

Thats exactly what I needed plus to access on server side. String.Join(";", selectedValues.ToArray()) – Muneeb Mirza Jan 05 '16 at 08:31
To top up on this solution, to convert the values to list of int, just do this ".Cast().Where(li => li.Selected).Select(li => li.Value).Select(int.Parse).ToList()" – TPG Dec 11 '17 at 06:31

score 15 · Answer 2 · edited Feb 19 '20 at 21:23

15

foreach (ListItem item in CBLGold.Items)
{
    if (item.Selected)
    {
        string selectedValue = item.Value;
    }
}

edited Feb 19 '20 at 21:23

TylerH

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answered Oct 18 '13 at 04:11

Arif Ansari

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1
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12

score 11 · Answer 3 · answered Sep 20 '13 at 19:15

11

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<ListItem>().Where(x => x.Selected);
// work with selected...

answered Sep 20 '13 at 19:15

mreyeros

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score 2 · Answer 4 · answered Feb 20 '14 at 15:53

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<ListItem> GetSelectedItems(this ListControl checkBoxList)
{
    return from ListItem li in checkBoxList.Items where li.Selected select li;
}

Visual Basic:

<Extension()> _
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()

score 1 · Answer 5 · answered Feb 03 '16 at 08:17

1

List<string> values =new list<string>();
foreach(ListItem Item in ChkList.Item)
{
    if(Item.Selected)
    values.Add(item.Value);
}

answered Feb 03 '16 at 08:17

Rohini Yejju

11
2

score 1 · Answer 6 · answered Dec 11 '17 at 06:32

1

To top up on @Tim Schmelter, in which to get back the List<int> instead,

List<string> selectedValues = CBLGold.Items.Cast<ListItem>()
   .Where(li => li.Selected)
   .Select(li => li.Value)
   .Select(int.Parse)
   .ToList();

answered Dec 11 '17 at 06:32

TPG

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score 1 · Answer 7 · edited Aug 19 '20 at 07:23

1

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.

edited Aug 19 '20 at 07:23

Jared Forth

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answered Aug 18 '20 at 22:47

Bruce H Bitterman

11
1

score 1 · Answer 8 · answered Jan 03 '21 at 05:29

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(",", CBLGold.Items.OfType<ListItem>().Where(r => r.Selected).Select(r => r.Value));

if you want to store Text not values then Change the r.Value to r.Text

score 0 · Answer 9 · edited Dec 27 '14 at 13:18

0

string s= string.Empty

for (int i = 0; i < Chkboxlist.Items.Count; i++)

{

    if (Chkboxlist.Items[i].Selected)
    {
        s+= Chkboxlist.Items[i].Value + ";"; 
    }

}

edited Dec 27 '14 at 13:18

Sarvesh Mishra

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answered Dec 27 '14 at 12:56

Gopal Reddy Vinnamala

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1. You should explain your code a little. 2. Why are you posting an answer to a one year old question that already has an accepted answer? – fancyPants Dec 27 '14 at 13:15

score 0 · Answer 10 · edited Feb 19 '20 at 21:11

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("<br>" + 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.

This does not provide an answer to the question; it's just a longwinded description of how you wrote a similar thing but it didn't work because you... didn't write it correctly. Answers on Stack Overflow should be direct attempts to answer *the question that was asked* or *problem that was posed*; they're not the place to share similar anecdotes. — TylerH, Feb 19 '20 at 21:12

score 0 · Answer 11 · answered Nov 05 '20 at 10:03

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 = "")
{
    return string.Join(separator, cbl.Items.Cast<ListItem>().Where(li => li.Selected).ToList());
}

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

11 Answers11

C Sharp:

Visual Basic:

Linked