/// <summary>
/// Reads existing Historical parameter values
/// </summary>
private void ReadParameters()
{
var existingParameters = XmlFileManager.GetHistoricalParameters(_filePath);
// Get Start Date
SelectedStartDate = DateTime.ParseExact(existingParameters.Item1, "yyyy,MM,dd", CultureInfo.InvariantCulture);
// Get End Date
SelectedEndDate = DateTime.ParseExact(existingParameters.Item2, "yyyy,MM,dd", CultureInfo.InvariantCulture);
// Get provider name
SelectedProvider.ProviderName = existingParameters.Item3;
}