Question: I am using Visual Studio 2015 with ASP.NET & C#. I have this calculation I am trying to implement into C# coding, but it says abs and min math functions are not there. 

This is the code:

```
private double angle(int h, int m)
{
    h = Convert.ToInt32(ddlHours.SelectedItem.Value);
    m = Convert.ToInt32(ddlMinutes.SelectedItem.Value);

    double hAngle = 0.5D * (h * 60 + m);
    double mAngle = 6 * m;
    double angle = Math.abs(hAngle - mAngle);
    angle = Math.min(angle, 360 - angle);
    return angle;
}

```

Ultimately, I want the answer to go to my label. 

How do I get the abs and min function, or is there another way that still provides the accuracy of this calculation?

Answer: 
c# is case sensitive

```
double angle = Math.Abs(hAngle - mAngle);
angle = Math.Min(angle, 360 - angle);

```
I would suggest a few things;

* C# is a [case sensitive](https://en.wikipedia.org/wiki/Case_sensitivity) language. The right syntax of those methods are [`Math.Abs`](https://msdn.microsoft.com/en-us/library/system.math.abs) and [`Math.Min`](https://msdn.microsoft.com/en-us/library/system.math.min)
* Depending on your structure of course but this method would be better as a [static method](https://stackoverflow.com/q/4124102/447156) since *probably* it will not need an instance to calculate this angel value.
* You don't assign your `ddlHours.SelectedItem.Value` and `ddlMinutes.SelectedItem.Value` to your parameters inside of your method. In such a case, there will be difference between `angle(5, 30)` and `angle(6, 40)` method calls since both do the calculation based on those dropdownlist values.
* Parse your dropdownlist values to integer and call your `angel` method with those parameters.

```
static double angle(int h, int m)
{
    double hAngle = 0.5D * (h * 60 + m);
    double mAngle = 6 * m;
    double angle = Math.Abs(hAngle - mAngle);
    return Math.Min(angle, 360 - angle);
}

```

and call this method as;

```
int h = Convert.ToInt32(ddlHours.SelectedItem.Value);
int m = Convert.ToInt32(ddlMinutes.SelectedItem.Value);

double angel = YourType.angel(h, m);

```