related RadcomboBoxes gets reset after changingselectedIndexes

[shemein]

I have two Radcombobox which the first one is binding to a dataTable. when the Item is selected from the first radcombobox according to that the second one Items maybe populated or if not we have to be able to type in it. when I click in the second one to type (for example:5555) the drop down collapses and 5555 is removed and it shows the default text so fast and the user oblige to open it again. I want the Radcombobox doesn't get refresh.

[Shinu]

Hi shemein,

Please try the below sample code snippet which works fine at my end. Please provide your code if it doesn't help.

ASPX:

<telerik:RadComboBox ID="rcboFirstList" runat="server" DataSourceID="sqldsOrders" EmptyMessage="select" DataTextField="Id" DataValueField="text" AutoPostBack="true" OnSelectedIndexChanged="rcboFirstList_SelectedIndexChanged">
</telerik:RadComboBox>
<telerik:RadComboBox ID="rcboSecondList" runat="server" AutoPostBack="true" AllowCustomText="true" EmptyMessage="Select">
</telerik:RadComboBox>

C#:

protected void rcboFirstList_SelectedIndexChanged(object sender, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e)
{
    SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM ComboSecond WHERE ID=@ID", connection);
    adapter.SelectCommand.Parameters.AddWithValue("@ID", e.Text);
    DataTable dt = new DataTable();
    adapter.Fill(dt);
    if (dt.Rows.Count != 0)
    {
        rcboSecondList.DataTextField = "ID";
        rcboSecondList.DataSource = dt;
        rcboSecondList.DataBind();
    }
}

Thanks,
Shinu.