public void ShowChart()
{
List <Tuple <DateTime, float> > tuples;
tuples = DataBaseSolution.GetWeightList(user1.UserId);
if (tuples.Count() > 0)
{
valueList = new List <KeyValuePair <string, double> >();
foreach (Tuple <DateTime, float> item in tuples)
{
var date = (item.Item1).ToString("MM/dd/yyyy");
var weight = Math.Round(float.Parse(item.Item2.ToString()), 2);
valueList.Add(new KeyValuePair <string, double>(date, weight));
}
lineChart.DataContext = valueList;
}
}