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

Problem:

System.FormatException was unhandled by user code

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

  Source=mscorlib

  StackTrace:

       at System.Text.StringBuilder.AppendFormat(IFormatProvider provider, String format, Object[] args)

       at System.String.Format(IFormatProvider provider, String format, Object[] args)

       at System.String.Format(String format, Object arg0)

       at MultiThreadedDbSeeder.Program.<Main>b__0(Int32 i) in C:\xxxx\Program.cs:line 22

       at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.b__c()

  InnerException:

Offending Line:

SqlCommand cmd = new SqlCommand(string.Format(@"insert into table_1 (vch_value) values('{1}')", "the value of i is " + i));

Solution:

Don’t forget that string.Format uses a zero based index.

Fixed Code:

SqlCommand cmd = new SqlCommand(string.Format(@"insert into table_1 (vch_value) values('{0}')", "the value of i is " + i));