Binding 10K + elements to a dropdown list with selection

Question

Hi Geeks,

 

I am having a dropdown in asp.net like -

 

<dx:ASPxGridLookup ID="SelectionGrid" Visible="false" runat="server" SelectionMode="Multiple" Width="350px"
MultiTextSeparator=";" EnableFocusedStyle="false" GridViewProperties-Settings-ShowVerticalScrollBar="true"
AllowUserInput="true" GridViewProperties-SettingsPager-Mode="ShowPager" GridViewProperties-SettingsPager-PageSize="50" IncrementalFilteringMode="None"
TextFormatString="{0}" KeyFieldName="Key" IncrementalFilteringDelay="1200" GridViewProperties-Settings-ShowFilterRowMenu="true"
FocusedStyle-ForeColor="Black" GridViewProperties-Settings-ShowFilterRow="true" ClientSideEvents-KeyUp="function (s, e) {return false;}"
AutoPostBack="false" GridViewProperties-EnableCallBacks="true">
<Columns>
<dx:GridViewCommandColumn ShowSelectCheckbox="True" Width="60px" HeaderStyle-Cursor="auto"
Caption="Select" />
<dx:GridViewDataTextColumn Caption="Vint" Width="200px" Visible="True" Settings-AllowSort="False"
Settings-ShowFilterRowMenu="True" Settings-ShowInFilterControl="True" Settings-AllowAutoFilterTextInputTimer="True"
Settings-AllowAutoFilter="True" FieldName="Value" Settings-AutoFilterCondition="Contains"
CellStyle-ForeColor="Black" CellStyle-Font-Bold="false" Settings-FilterMode="DisplayText">
</dx:GridViewDataTextColumn>
</Columns>
</dx:ASPxGridLookup>

My dropdown gets hanged when the items get loaded on the click of dropdown.

Can you please suggest some method/improvements so that the dropdown shows loading on click of dropdown till the items get loaded in the dropdown.

 

some code will be helpful.

 

thanks,