System.Data.DefaultValueTypeConverter.ConvertTo C# (CSharp) Method

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == null)
            {
                throw new ArgumentNullException(nameof(destinationType));
            }

            if (destinationType == typeof(string))
            {
                if (value == null)
                {
                    return NullString;
                }
                else if (value == DBNull.Value)
                {
                    return DbNullString;
                }
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }