You can use class DiamondSquare like in example:
var sizePower = 3; //result size = pow(2, sizePower) + 1
var persistence = 1.1;
var config = new DiamondSquareConfig(sizePower, persistence /*optional*/);
var generator = new DiamondSquare(config);
float[,] heights = generator.Generate();
You can also use an asynchronous call:
float[,] heightsTask = await generator.GenerateAsync();
You can use class Noise:
var size = 1000;
var persistence = 0.67; //best results between 0.5 and 0.8
var config = new NoiseConfig(sizePower, persistence);
var generator = new Noise(config);
float[,] heights = generator.Generate();
//or
Task<float[,]> heights = generator.GenerateAsync();