Implementation of Trapezoidal Rule (Integral Approximation) written in C#.

```Enter beginning of interval: -2
Enter end of interval: 2
Enter number of iterations: 1000000
Integral is equal to: 5.33334933334409
```
```using System;

// ? 2018 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net
namespace Trapezoidal_Rule
{
class Program
{
static void Main(string[] args)
{
double intervalBegin;
double intervalEnd;
int iterations;
double integral;
double step;

Console.Write("Enter beginning of interval: ");
intervalBegin = Convert.ToDouble(Console.ReadLine());

Console.Write("Enter end of interval: ");
intervalEnd = Convert.ToDouble(Console.ReadLine());

Console.Write("Enter number of iterations: ");
iterations = Convert.ToInt32(Console.ReadLine());

step = (intervalEnd - intervalBegin) / iterations;
integral = 0.5 * (function(intervalBegin) + function(intervalEnd));

for (int i = 0; i < iterations; ++i)
{
integral += function(intervalBegin + step * i);
}

integral *= step;

Console.WriteLine("Integral is equal to: " + integral);
Console.ReadKey();
}

private static double function(double x)
{
return x * x;
}
}
}
```

C# Trapezoidal Rule

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