ASP chart StackedColumn100 add percent symbol (%) on values

Question

I have this chart (using Chart control build-in on .NET):

How do I add percent sign (%) behind of all values (for example 44 => 44%, 56 => 56% and so on)

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Edit (after tried jstreet's sugesstions in comment): StackedColumn100 chart so values are already percentages.

Tried <asp:Series Label="#VAL%">, got this: (notice that the 0 values are showing up which I don't want, I used these codes to hide those 0 values initially):

protected void RequestChart_Customize(object sender, EventArgs e)
        {
            //hide label value if zero
            foreach (System.Web.UI.DataVisualization.Charting.Series series in RequestChart.Series)
            {
                foreach (System.Web.UI.DataVisualization.Charting.DataPoint point in series.Points)
                {
                    if (point.YValues.Length > 0 && (double)point.YValues.GetValue(0) == 0)
                    {
                        point.IsValueShownAsLabel = false;
                    }
                }
            }
        }

Tried <asp:Series LabelFormat="P2">, got this

Answer 1

This is working for me: LabelFormat="{0}%", change {0} to {0.0} or {0.00} depend on how do you want to display those values.

BTW, to hide 0 values on the chart, add this Customize event to your chart:

protected void RequestChart_Customize(object sender, EventArgs e)
        {
            //hide label value if zero
            foreach (System.Web.UI.DataVisualization.Charting.Series series in RequestChart.Series)
            {
                foreach (System.Web.UI.DataVisualization.Charting.DataPoint point in series.Points)
                {
                    if (point.YValues.Length > 0 && (double)point.YValues.GetValue(0) == 0)
                    {
                        point.IsValueShownAsLabel = false;
                    }
                }
            }
        }