private void MainForm_Load(object sender, EventArgs e)
{
AutoCompleteConfigure(configurationSectionTextBox, Settings.Default.ConfigSectionsHistory);
configurationSectionTextBox.AutoCompleteMode = AutoCompleteMode.Suggest;
configurationSectionTextBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
AutoCompleteConfigure(customProviderTextBox, Settings.Default.CustomProvidersHistory);
customProviderTextBox.AutoCompleteMode = AutoCompleteMode.Suggest;
customProviderTextBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
}