/// <summary> /// Gets a filter with a criteria in string representation. /// </summary> /// <param name="columnName"> /// The name of the column for which the criteria should be generated. /// </param> /// <returns>a string representing the current filter criteria</returns> public override string GetFilter(string columnName) { if (!HasFilter) { return(""); } return(string.Format(FILTER_FORMAT, columnName, _enumerationSource.GetFilterFromValue(_combo.SelectedItem))); }