public MainViewModel()
{
Instance = this;
DataTypes.AddRange(Enum.GetValues(typeof(DataType)) as IEnumerable <DataType>);
DataCompareTypes.AddRange(Enum.GetValues(typeof(DataCompareType)) as IEnumerable <DataCompareType>);
StringCompareTypes.AddRange(Enum.GetValues(typeof(StringCompareType)) as IEnumerable <StringCompareType>);
}