With only minor change to a name, i attempted to run this example. No luck. I get the error //D:\TrainingFiles\BegVCSharp\Chapter06\ch06ex05a\ch 06ex05a\ch06ex05a\Class1.cs(58): Use of unassigned local variable 'myProcess'. Any ideas? Does anyone get it to run? Here is the code:
    class Class1
    {
        //CREATE THE DELEGATE PART -- MUCH LIKE A POINTER
        delegate double ProcessDelegate(double param1, double param2);

        //COUPLE OF NORMAL FUNCTIONS
        static double Multiply(double param1, double param2)
        {
            return param1 * param2;
        }

        static double Divide(double param1, double param2)
        {
            return param1 / param2;
        }

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            //
            ProcessDelegate myProcess; //declare the delegate

            Console.Write("Enter 2 numbers, separated by a comma: ");
            string input = Console.ReadLine();

            int commaPos = input.IndexOf(",");
            double p1 = Convert.ToDouble(input.Substring(0, commaPos));
            double p2 = Convert.ToDouble(input.Substring(commaPos + 1, input.Length - commaPos - 1));

            //SET UP THE DELEGATE TO USE
            Console.Write("Enter M to Multiply or D to Divide: ");
            input = Console.ReadLine().ToUpper();

            //myProcess = new ProcessDelegate(Multiply);

            if (input == "M") //bad form, since "q" input caused divide
            {
                myProcess = new ProcessDelegate(Multiply);
            }
            else
            {
                if (input == "D")
                {
                    myProcess = new ProcessDelegate(Divide);
                }
            }

            Console.WriteLine("Result: {0} ", (myProcess(p1, p2))); //use the delegate
            //we get this error
            //D:\TrainingFiles\BegVCSharp\Chapter06\ch06ex05a\ch 06ex05a\ch06ex05a\Class1.cs(58): Use of unassigned local variable 'myProcess'

            Console.Read();
        }
    }


If you are not part of the solution, there is good money to be made by prolonging the problem.

This warning says that there are situations where myProcess may have no value. That is, when you enter a value other than M or D, myProcess will still be null.

To avoid the error, assign null to myProcess when you declare it: Additionally, you may want to check if it's null before using it: Hope this helps,

Imar
---------------------------------------
Imar Spaanjaars
http://Imar.Spaanjaars.Com
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