CODEWITHSUNDEEP
c#asp.netlistboxselectedlistitem
ragu
ragu

Reputation: 165

How to set multiple items as selected in ListBox?

I have one ListBox with selection mode of multiple. In code behind, I want to set some values as selected. These values are present in a ListItems[] named 'Names'.

HTML code:

<asp:ListBox ID="lbto" class="chosen" runat="server" Width="450px" 
 Height="20px" SelectionMode="Multiple">
    <asp:ListItem>Mandy</asp:ListItem>
    <asp:ListItem>Amit</asp:ListItem>
    <asp:ListItem>sundar</asp:ListItem>
    <asp:ListItem>ragu</asp:ListItem>
    <asp:ListItem>raju</asp:ListItem>
</asp:ListBox>

ListItem[] Names contains 'ragu' and 'raju'. Now, when the page loads, the ListBox should contain 'ragu' and 'raju' as selected values.

Upvotes: 7

Views: 40384

Answers (4)

Ideoken
Ideoken

Reputation: 11

int[] IndexList = new int[] { 1, 3, 5, 7, 9 };
for (int i = 0; i < IndexList.Length; i++)
{
    if (listBox1.Items.Count > IndexList[i])
    {
        listBoxFX.SetSelected(IndexList[i], true);
    }
}

Upvotes: 1

Alejandro Haro
Alejandro Haro

Reputation: 1394

You can use FindByValue method 

foreach (string item in stringList)
    lbxList.Items.FindByValue(item).Selected = true;

Upvotes: 2

Damith
Damith

Reputation: 63065

Using One line of linq

lbto.Items.Cast<String>().ForEach(i => i.Selected = names.Contains(i.Text));

OR

lbto.Items.OfType<string>().ForEach(i => i.Selected = names.Contains(i.Text));

Upvotes: -1

Carsten
Carsten

Reputation: 11606

What about setting the Selected-property of the ListItem?

var names = new List<string>(new string[] { "ragu", "raju" });

foreach (var item in lbto.Items)
{
    if (names.Contains(item.Text))
        item.Selected = true;
}

Upvotes: 15

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