How to set multiple selections in ASP.NET ListBox? - asp.net

Question

I can't find a way to select multiple items in an ASP.NET ListBox in the code behind? Is this something needs to be done in Javascript?

Answer 1

You will have to use FindByValue method of the ListBox
foreach (string selectedValue in SelectedValuesArray)
{
lstBranch.Items.FindByValue(selectedValue).Selected = true;
}

Answer 2

Here's a C# sample
(aspx)
<form id="form1" runat="server">
<asp:ListBox ID="ListBox1" runat="server" >
<asp:ListItem Value="Red" />
<asp:ListItem Value="Blue" />
<asp:ListItem Value="Green" />
</asp:ListBox>
<asp:Button ID="Button1"
runat="server"
onclick="Button1_Click"
Text="Select Blue and Green" />
</form>
(Code Behind)
protected void Button1_Click(object sender, EventArgs e)
{
ListBox1.SelectionMode = ListSelectionMode.Multiple;
foreach (ListItem item in ListBox1.Items)
{
if (item.Value == "Blue" || item.Value == "Green")
{
item.Selected = true;
}
}
}

Answer 3

this is the VB code to do so...
myListBox.SelectionMode = Multiple
For each i as listBoxItem in myListBox.Items
if i.Value = WantedValue Then
i.Selected = true
end if
Next

Answer 4

In C#:
foreach (ListItem item in ListBox1.Items)
{
item.Attributes.Add("selected", "selected");
}

Answer 5

I like where bill berlington is going with his solution. I don't want to iterate through the ListBox.Items for each item in my array. Here is my solution:
foreach (int index in indicesIntArray)
{
applicationListBox.Items[index].Selected = true;
}