[Solved] Console (Input string was not in correct format)

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Use Integer.TryParse to handle the strings potentially not being numbers. Then prompt the user if the input is not parsable to enter valid input.

Convert and Parse both will throw exceptions if the string is not an exact number.

https://msdn.microsoft.com/en-us/library/f02979c7%28v=vs.110%29.aspx

        int n = 0;
        int sum = 0;
        int i = 0,val = 0;
        Console.Write("How many numbers do you want calculate: ");
        var isValidNumber = Int32.TryParse(Console.ReadLine(), out n);
        if(!isValidNumber) {
            Console.WriteLine("Invalid number entered!");
        }
        else {
           //Use the number
        }

5

solved Console (Input string was not in correct format)