Hi Subrata,
Thank you for your interest in Syncfusion Products.
We can retrieve the correct matching item using CaseSensitive property to true and retrieving the value using AutoCompleteItemSelected event. Kindly refer to the below sample and the code snippet provided below:
private void comboBoxAutoComplete1_AutoCompleteControl_AutoCompleteItemSelected(object sender, Syncfusion.Windows.Forms.Tools.AutoCompleteItemEventArgs args)
{
textBoxExt1.Text = this.comboBoxAutoComplete1.AutoCompleteControl.SelectedItem.ItemArray[0].ToString();
}
http://files.syncfusion.com/support/Tools.Windows/7.1.0.30/F80545/main.htmPlease let me know if any concerns.
Regards,
Fathima