System.FormatException: 'Input string was not in a correct format.' C#, beginner

This is the problem:

using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp6
{
    class Program
    {
        static void Main(string[] args)
        {

            int num, num1, num2, num3;
            Console.WriteLine("Enter a number");
            num = int.Parse(Console.ReadLine());
            num1 = num + 1;
            num2 = num + 2;
            num3 = num + 3;

            // The following line throws the error
            Console.WriteLine("The next numbers are:{0}(1}{2}", num1, num2, num3);
            Console.ReadKey();
        }
    }
}

I try to start, and it writes about the commented line:

System.FormatException: 'Input string was not in a correct format.'


You line is incorrect formatted

Console.WriteLine("The next numbers are:{0}(1}{2}", num1, num2, num3);
                                           ^

Change it to {

You get the error because only two input brackets are specified, but you supply three parameters.

.NET Exceptions - System.FormatException, Try using "0,85" instead of "0.85". I think you can use the dot decimal if you change culture. Here is some more information: How to change  Moving along through our in-depth.NET Exception Handling series, today we come across the System.FormatException. As the name implies, the System.FormatException is thrown in a wide variety of scenarios, yet they all revolve around providing an improperly formatted argument to a vast array of methods and API calls.


The next numbers are:{0}(1}{2}

You misplaced a { as ( at placeholder 1.

System.FormatException : Input string was not in a correct format ,on , FormatException is thrown when the format of an argument in a method invocation does not match the format of the corresponding formal parameter type. For  System.FormatException Class Assembly: Mscorlib.dll Namespace: System Summary The exception that is thrown when the format of an argument does not meet the parameter specifications of the invoked method.


Type: System.FormatException, 1. The exception is generated because you are trying to convert to int a string value that is not an int, in your case may happen that your  System.FormatException of a string [duplicate] Ask Question I'm getting System.FormatException: Input string was not in a correct format when running this method.


[Solved] System.FormatException: Input string was not in a correct , using System; class Demo { static void Main() { string str = "3.5"; int res = int.Parse​(str); } }. The following error is thrown when the above  Every time I hit the calculate button I receive the following message: An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll Additional information: Input string was not in a correct format. I'm supposed to display a message when the wage input is below $9.75. It then highlights this line of code:


FormatException in C#, the code run error: System.FormatException: 'Input string was not in a correct format. An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in >user code Additional information: Input string was not in a correct format.


System.FormatException: 'Input string was not in a correct , the code run error: System.FormatException: 'Input string was not in a correct format.' Console.WriteLine(" Url={0}, Topic={1}"  This constructor initializes the Message property of the new instance to a system-supplied message that describes the error, such as "Invalid format." This message takes into account the current system culture. The following table shows the initial property values for an instance of FormatException.