Telerik RadComboBox supports the functionality to autocomplete the current text of the combobox to the first matching item in the Items collection of the combobox and highlight the difference. What you have to do is to set the MarkFirstMatch property of the combo to true.
Examples
The following example shows auto-complete from SQL:

| ASPX |
Copy Code |
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<radcb:RadComboBox id="RadComboBox1" Runat="server" Height="140px" Width="350px" Skin="WindowsXP" ToolTip="Select a city" WrapItemText="True" AllowCustomText="False" MarkFirstMatch="True"> </radcb:RadComboBox> |
This example shows auto-complete from a flat text dictionary file:

See live example at:
Autocomplete client-side
See Also