Rad combo multiple column deadly slow

[kollam2003]

I have a combo box.
Almost 500 rows is bind to the combo at run time.

<telerik:RadComboBox ID="RadComboBox_SchoolName_Search" runat="server" Skin="Default"
                        Width="575px" Font-Names="Arial" HighlightTemplatedItems="true" MarkFirstMatch="true"
                        AutoPostBack="true" EnableTextSelection="true" EnableItemCaching="true">
                        <HeaderTemplate>
                            <table style="text-align: left; width: 575px">
                                <tr>
                                    <td style="width: 400px; font-weight: bold;">
                                        School Name
                                    </td>
                                    <td style="width: 175px; font-weight: bold;">
                                        State
                                    </td>
                                </tr>
                            </table>
                        </HeaderTemplate>
                        <ItemTemplate>
                            <table style="width: 630px; text-align: left">
                                <tr>
                                    <td style="width: 430px;">
                                        <%# DataBinder.Eval(Container.DataItem, "SchoolName")%>
                                    </td>
                                    <td style="width: 200px;">
                                        <%# DataBinder.Eval(Container.DataItem, "State")%>
                                    </td>
                                </tr>
                            </table>
                        </ItemTemplate>
  <CollapseAnimation Duration="200" Type="None" />
                    </telerik:RadComboBox>

and bind using

 private void Populate_RadComboBox_SchoolName_Search()
    {
        DataTable _SchoolwithState = new DataTable();
        _SchoolwithState.Clear();
        RadComboBox_SchoolName_Search.Items.Clear();
        _SchoolwithState = objLookup.Populate_SchoolwithStatename();
        if (_SchoolwithState.Rows.Count > 0)
        {
            if (_SchoolwithState.Rows.Count > 15)
            {
                RadComboBox_SchoolName_Search.Height = 410;
            }

            RadComboBox_SchoolName_Search.DataSource = _SchoolwithState;
            RadComboBox_SchoolName_Search.DataTextField = "SchoolName";
            RadComboBox_SchoolName_Search.DataValueField = "SchoolID";
            RadComboBox_SchoolName_Search.DataBind();
        }
        RadComboBox_SchoolName_Search.Items.Insert(0, new RadComboBoxItem("---Search Students by School Name---"));
    }

At run time, I have to wait for a long time to load the drop down after clicking the arrow.
Is there any other methods to make it fast.
Please help.

[Shinu]

Hello,

Here are some suggestions on how to improve the performance of RadControls.

Load On Demand
Optimizing output, page load time and the overall performance of RadControls for ASP.NET AJAX

I hope you will find these as useful,
Shinu.

[kollam2003]

hi Shinu,
Its slow when i'm adding

<ItemTemplate>

<table style="width: 630px; text-align: left">

<tr>

<td style="width: 430px;">

<%# DataBinder.Eval(Container.DataItem, "SchoolName")%>

</td>

<td style="width: 200px;">

<%# DataBinder.Eval(Container.DataItem, "State")%>

</td>

</tr>

</table>

</ItemTemplate>

is dere any other way to implement this?

[Kamen Bundev]

Hello,

Check this example, the grid-like multi-column RadComboBox is not done with tables but instead with an unordered list:
http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multicolumncombo/defaultcs.aspx

Sincerely yours,
Kamen Bundev
the Telerik team

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