/// <summary>
/// Converts the filter value into a string as expected by the SendGrid segmenting API.
/// Can be overridden in subclasses if the value needs special formatting.
/// </summary>
/// <returns>The string representation of the value.</returns>
public virtual string ConvertValueToString()
{
return(SearchCriteria.ConvertToString(FilterValue));
}
/// <summary>
/// Converts the filter value into a string as expected by the SendGrid Email Activities API.
/// </summary>
/// <returns>The string representation of the value.</returns>
public override string ConvertValueToString()
{
return($"{SearchCriteria.ConvertToString(FilterValue)} AND {SearchCriteria.ConvertToString(UpperValue)}");
}