using System;

using System.Linq.Expressions;

using static System.Math;

​

public class Program

{

    public static void Main()

    {

        var a = 49; // taken from db dataentry table

        var c = 6; // taken from db dataentry table

        var result = Expression.Doit(a, c);

        Console.WriteLine(result);

    }

​

    public class Expression

    {

        public static double Doit(double arg1, double arg2)

        {

            Expression<Func<double, double, double>> expression = (a, c) => Sqrt(a) * c;

            var result = expression.Compile().Invoke(arg1, arg2);

            return result;

        }

    }

}