NumEval Control - Version 1.00 With this ActiveX Numeric Evaluation Control you can evaluate Basic-like numeric expressions provided as string, enhance the BASIC syntax by defining your own functions, include variables and placeholders into the expressions to be evaluated and have the syntax checked before having the expression evaluated. In case of an syntax error or evaluation error the control provides you with an error code, an error message string and the exact position in the string where the error occurred.