Index (zero based) must be greater than or equal to zero

Question

Hey I keep getting an error:

Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

Answer 1

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine("Enter Your FirstName ");
            String FirstName = Console.ReadLine();

            Console.WriteLine("Enter Your LastName ");
            String LastName = Console.ReadLine();
            Console.ReadLine();

            Console.WriteLine("Hello {0}, {1} ", FirstName, LastName);
            Console.ReadLine();

        }
    }
}

Answer 2

In my case I could not see the mistake "+name". The compiler would not report an error in this case. So take care.

//Wrong Code:

string name="my name";
string age=25;
String.Format(@"Select * from table where name='{1}' and age={1}" +name, age);


//Right Code:

string name="my name";
string age=25;
String.Format(@"Select * from table where name='{1}' and age={1}" , name, age);

Answer 3

In this line:

Aboutme.Text = String.Format("{2}", reader.GetString(0));

The token {2} is invalid because you only have one item in the parms. Use this instead:

Aboutme.Text = String.Format("{0}", reader.GetString(0));

Answer 4

String.Format must start with zero index "{0}" like this:

Aboutme.Text = String.Format("{0}", reader.GetString(0));

Answer 5

Your second String.Format uses {2} as a placeholder but you're only passing in one argument, so you should use {0} instead.

Change this:

String.Format("{2}", reader.GetString(0));

To this:

String.Format("{0}", reader.GetString(2));

Answer 6

This can also happen when trying to throw an ArgumentException where you inadvertently call the ArgumentException constructor overload

public static void Dostuff(Foo bar)
{

   // this works
   throw new ArgumentException(String.Format("Could not find {0}", bar.SomeStringProperty));

   //this gives the error
   throw new ArgumentException(String.Format("Could not find {0}"), bar.SomeStringProperty);

}