How to set different colors for each bar in bar chart WPF

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color

bar

chart

List<KeyValuePair<string, int>> MyValue = new List<KeyValuePair<string, int>>();
          MyValue.Add(new KeyValuePair<string, int>("Maths", 200));
          MyValue.Add(new KeyValuePair<string, int>("Physics", 136));
          MyValue.Add(new KeyValuePair<string, int>("Chemistry", 189));
          MyValue.Add(new KeyValuePair<string, int>("English", 70));
          MyValue.Add(new KeyValuePair<string, int>("Tamil", 240));
          MyValue.Add(new KeyValuePair<string, int>("kannadam", 10));

          ColumnChart1.DataContext = MyValue;

Iam using this above code to construct barchart but i want to set different color bar for each subject..please help me my coder lengends
Thanks

What I have tried:

MyValue.Add(new KeyValuePair<string, int>("Maths", 200,Colors.Red));
           MyValue.Add(new KeyValuePair<string, int>("Physics", 136,Colors.Black));

how to pass color aruguments