C# converting a string into a function call

Reflection is the way to do it.

Assuming  SMA() is defined like this

class MyClass{
  private int SMA(){
    return 1;
  }
}

MyClass foo = new MyClass();
 
MethodInfo mi = foo.GetType().GetMethod("SMA",
  BindingFlags.Instance | BindingFlags.NonPublic);
 
int i = (int)mi.Invoke(foo, null);

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Caveman method

 Dictionary<string,function>  funcmap = new ....;

 funcmap["SMA"] = functionName ();
 funcmap["Other"] = functionOther ();

  callfunc( string funcname )
  {
      int result = funcmap[funcname];
 }

Thanks all for the solutions.
Does using Reflection have a significant impact on performance?

Thanks this has been very helpful.
Using Reflection, while giving me the flexibility I would like, will not give me the speed I need. "Invoke" could be called multiples of thousands of times depending on the size of the data set being used in my application. Standard function calls seems to be the way to go.

In some cases I've used a switch to catch common method names and directly call the functions. The default option uses reflection.