Question

I am using Ajax toolkit with a combobox functionality, the items being displayed are around 40,000, so I want to apply a filter on the same, so that a user types an alphabet in the combobox and corresponding entries with starting alphabet “a” will be displayed in the combobox.

Can I have an idea, I am not using Radcombobox, it is a simplest combobox.

<asp:ComboBox ID="AppComCombx" runat="server" 
                                CssClass="dropdownpersonal textfont" 
                                onselectedindexchanged="AppComCombx_SelectedIndexChanged" AutoPostBack="true"> 
</asp:ComboBox>

Answer 1

Try this : AutoCompleteMode = "SuggestAppend"

Like this

<ajaxToolkit:ComboBox ID="ComboBox1" runat="server"
     AutoPostBack="False"
     DropDownStyle="DropDownList"
     AutoCompleteMode="SuggestAppend"
     CaseSensitive="False"
     CssClass=""
     ItemInsertLocation="Append" /> 

For more info go here