C# winform chart - data points reduction

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C#

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I'm plotting a graph using PictureBox. To fit all the points in the control width, I'm using normal averaging technique. I want to understand is this the only way to do so, or there's any other formula.

I feel like loosing the data trend (I can visualize that when I've large number of points to be plotted in small area) with this technique.

Can anyone share me the pointers for further research, such as which data reduction/compression/calculation technique I can use, so that I can fit 50K of data points in 100 pixel control without loosing the data trend.

What I have tried:

Normal averaging method.

To explain it better, lets say I've to plot 1000 values on the PictureBox of width 100 Pixels. I calculate the ratio of count of values to be plotted to the PictureBox width, i.e 1000/100 = 10. That means, each pixel on the graph will represent the average of 10 value. With this I plot the graph of average of every 10 values resulting to show average of 1000 values on the PictureBox. This works fine with small set of data points.