Not able to add Checkboxlist selected items to String Array

Question

I have dynamically populated data to my checkboxlist from SqlServer data base.. using code

aspx

<asp:CheckBoxList ID="CheckBoxList1" runat="server">
</asp:CheckBoxList>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>

aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    SqlConnection cn = new SqlConnection(
        ConfigurationManager.ConnectionStrings["testingCS"].ConnectionString);
    cn.Open();
    SqlCommand cmd1 = new SqlCommand("select * from tbl_vehicletypes", cn);
    SqlDataReader dr = cmd1.ExecuteReader();
    if (dr.HasRows) {
        CheckBoxList1.DataSource = dr;
        CheckBoxList1.DataTextField = "typedesc";
        CheckBoxList1.DataValueField = "vehicletypeid";
        CheckBoxList1.DataBind();
    }
}

protected void Button1_Click(object sender, EventArgs e)
{
    string[] arr = new string[10];

    for (int i = 0; i < CheckBoxList1.Items.Count; i++)
        if (CheckBoxList1.Items[i].Selected==true)
            arr[i] = CheckBoxList1.Items[i].Value;

    foreach (string s in arr)
        Label2.Text += s + "<br />";
    Label2.Text = CheckBoxList1.Items.Count.ToString();
}

I tried using for loop and foreach as well but it didn't work out. The selected data is not getting added to string array..

Please help

display name · Accepted Answer · 2014-04-01 18:14:17Z

1

Try this

List<string> selectedValues = CheckBoxList1.Items.Cast<ListItem>()
   .Where(li => li.Selected)
   .Select(li => li.Value)
   .ToList();

foreach(string s in selectedValue)
   Label2.Text += s + "<br />";

edited Apr 1, 2014 at 18:14

answered Apr 1, 2014 at 17:50

display name

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6 Comments

Itniv Over a year ago

Im facing issues in the for loop when im tracing using checkpoints.. CheckBoxList1.Items[i].Selected shows false even if the item is selected... out of 8 elements i selected first 2 elements but still it doesnt add to the string array

display name Over a year ago

post the entire code so we can check the implementation for you. Thanx

display name Over a year ago

What is the Label2? I don't see it in your code. There is nothing wrong with the button click code I believe. So the only problem is that Label2 is not showing the text. Could you post the code for Label2?

Itniv Over a year ago

I just placed a label control.. to display what the data which is copied into the array... at the moment when i run the code. it shows 8 elements in the checkboxlist.. if i select first 2 .. and click the button.. and start tracing it.. if (CheckBoxList1.Items[i].Selected==true) this statement is not getting validated.. for the first 2 ..

display name Over a year ago

If you want to dynamically change the text as the user selects the values, use JavaScript

|

Michael McGriff · Accepted Answer · 2014-04-01 18:04:39Z

0

This worked for me, hope it helps! Just a demo with one item but it'll work for any number of items in your CheckBoxList. How are you selecting the checkboxes?

CheckBoxList cbl = new CheckBoxList();

ListItem li = new ListItem("test");
li.Selected = true;
cbl.Items.Add(li);

Label labelTest = new Label();            

string[] test = cbl.Items.Cast<ListItem>().Where(l => l.Selected)
                                          .Select(l => l.Value)
                                          .ToArray();

labelTest.Text = String.Join("<br /", test);

answered Apr 1, 2014 at 18:04

Michael McGriff

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