You can try something like:
var t = Type.GetType("the full name of your class here");
if (t != null)
{
var methodToCall = t.GetMethod("Name of the method to call");
var result = methodToCall.Invoke(<targetornullifstaticmethod>, <parametersasanarrayofobjects>);
}
targetOrNullIfStaticMethod being the object instance on which you want to call the method
parametersAsAnArrayOfObjects being an array of the parameters the method is expecting (or null if no parameters)