Question

<asp:ListBox ID="listbox_Userrole"  runat="server" DataSourceID="SK" DataTextField="RoleName" DataValueField="RoleName" ></asp:ListBox>
<asp:SqlDataSource ID="SurelyKnown" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
                                ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>"
                                SelectCommand="SELECT RoleName FROM tbl_role WHERE RoleID&gt;1"></asp:SqlDataSource>

How to select first value in list box by default when the page loads.

Answer 1

In your code-behind, add the following to your Page_Load event handler:

protected override void Page_Load(object sender, EventArgs e)
{
    this.listbox_Userrole.SelectedIndex = 0;
}