Drawing issue of lines. | Infragistics Forums

Ok I am back to this issue. I am able to reproduce this easily now.

When I bind the chart series to a collection( mPoints) directly and in the timer code just do this.

i = i + 10;
mPoints.Add(new ChartDataPoint 
            { Date = DateTime.Now, YS = i, Y = Math.Sin(i) });
if(i>100)
   i =0;

where mPoints is a observed collection of class 

public class ChartDataPoint
    {
        public double Y { get; set; }
        public double YS { get; set; }
        public DateTime Date { get; set; }
 
    }


Then I dont see the issue in chart. 
But when I bind to a buffered data and 
copy the data from the buffered data into the mPoints 
then I see this issue

Note now the mPoints is a RangeObservedCollection( class derived 
from Observable collection)

public class ObservableRangeCollection<T> : 
         System.Collections.ObjectModel.ObservableCollection<T>
    {
 
        /// <summary>  
        /// Adds the elements of the specified collection to the end of the ObservableCollection(Of T).  
        /// </summary>  
        public void AddRange(IEnumerable<T> collection)
        {
            foreach (var i in collection)
            {
                Items.Add(i);
                if (Count > 60)
                    Items.RemoveAt(0);
            }
                OnCollectionChanged(new 
                      NotifyCollectionChangedEventArgs(
                       NotifyCollectionChangedAction.Reset));
        }
    }

 Now my timer code says something like this.

 void timer_Tick(object sender, EventArgs e)
        {
            if (mPoints != null)
            {
                i = i + 10;
                if (mBufferPoints != null)
                    mBufferPoints.Add(new 
                          ChartDataPoint { Date = DateTime.Now, 
                                           YS = i, 
                                           Y = Math.Sin(i) });
            }
            if (i > 100)
            {
                mPoints.AddRange(mBufferPoints);
                mBufferPoints.Clear();
                i = 0;
            }
        }

Any Idea what could be wrong.