AutoBuildCompleteString

        private bool autoBuildCompleteString = false;

  if (this.AutoBuildCompleteString)
                {
                    this.Edit.AutoCompleteSource = AutoCompleteSource.CustomSource;
                    this.Edit.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

                    this.Edit.AutoCompleteCustomSource = this.rgDataSource.AutoCompleteString;
                }
                else
                {
                    this.Edit.AutoCompleteMode = AutoCompleteMode.None;
                    this.Edit.AutoCompleteSource = AutoCompleteSource.None;
                }