Hi,
You can update Items via GetStore
Please see the following sample
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<script runat="server">
protected void Button_Click(object sender, DirectEventArgs e)
{
ComboBox1.Items.Clear();
ComboBox1.Items.Add(new Ext.Net.ListItem("3", "3"));
ComboBox1.Items.Add(new Ext.Net.ListItem("4", "4"));
ComboBox1.GetStore().DataBind();
}
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Ext.Net Example</title>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" ScriptMode="Debug" />
<ext:ComboBox ID="ComboBox1" runat="server">
<Items>
<ext:ListItem Text="1" Value="1" />
<ext:ListItem Text="2" Value="2" />
</Items>
</ext:ComboBox>
<ext:Button runat="server" Text="Add items">
<DirectEvents>
<Click OnEvent="Button_Click" />
</DirectEvents>
</ext:Button>
</form>
</body>
</html>