Weighted Random Picker C#

Program.cs

for (int i = 0; i < 100; i++) {
    var x = RandomPicker<string>.GetRandomChoice("A", 70, "B", 30);
    Console.WriteLine(x);
}

public class RandomPicker<T> {
    private static Random _random = new Random();

    public static T GetRandomChoice(T valueA, int weightA, T valueB, int weightB) {
        int totalWeight = weightA + weightB;
        int randomNumber = _random.Next(1, totalWeight + 1);

        if (randomNumber <= weightA) {
            return valueA;
        } else {
            return valueB;
        }
    }
}