Change text of legend in Chart?

Please see my example for the chart

Now, I am want to change text of the legends (don't show percent value) same as xValues of series data, such as: London, Tokyo, Paris,... (Still keep percent values in the pie).

Do you know how to do that ?

I used below codes:

int[] yValues = { 50, 20, 10, 20 }; 
string[] xValues = { "London", "Paris", "Newyork", "Tokyo"};

myChart.Series["Default"].Points.DataBindXY(xValues, yValues);
myChart.Series[0].Label = "#PERCENT{P2}";