Getting the next series number in c# win. form

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1.00/5 (2 votes)

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.NET3.5

I am stuck in getting the next series number. Example :-

1) I started the series from 1 and on getting the next series number 2, i saved the records like this till 100.

2) Then I skipped the numbers till 149 and started the series from 150 to 200.

3) After that when i again change the series from 101 till 149, the next series number after 149 should come 201. How to solve this?

Posted 16-Mar-14 0:33am

agent_kruger

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Maciej Los 16-Mar-14 7:02am

What have you done? Where are you stuck? Sample code might be helpful.

agent_kruger 17-Mar-14 3:18am

sir, for now i am using a recursive loop to get the next serial number which takes time if the records increase.

BillWoodruff 16-Mar-14 8:33am

Show some code. Your current problem description could mean many different things.

2 solutions

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OriginalGriff · Answer 1 · 2014-03-16T01:07:00

Solution 1

Exactly how you do this will depend on your code - and we have no idea how that works.
But - assuming that you have a collection of values, it's not complex:

C#

List<int> existing = new List<int>();
for (int i = 1; i <= 100; i++) existing.Add(i);
for (int i = 150; i <= 200; i++) existing.Add(i);
int minUnused = Enumerable.Range(existing.Min(), existing.Max() + 1).Except(existing).Min();

Posted 16-Mar-14 1:07am

OriginalGriff

Comments

agent_kruger 17-Mar-14 3:17am

sir, this is what i need but my record exists in "datatable".

OriginalGriff 17-Mar-14 12:15pm

So replace "existing" with the DataRows and build a List to pick the column with the ID.

agent_kruger 18-Mar-14 4:00am

sir, i am getting all records from database that would make it heavy, can you give me another way to handle it on the database side.

Maciej Los · Answer 2 · 2014-03-16T03:15:00

Not sure what you want, but...

Have a look at example:

C#

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> Serials= new List<int>();
            int tmpv =0;
            for (int i = 96; i <= 202; i += 2)
            {
                tmpv = GetNextSN(i);
                if(tmpv>0 && !Serials.Contains(i))
                {
                    Serials.Add(tmpv);
                }
                Console.WriteLine("Current value: {0}; SN: {1}",i,tmpv);
            }
            Console.ReadKey();
        }

        static int GetNextSN(int currSN)
        {
            int rv = currSN;
            if (rv <= 100)
                return rv;
            else
            {
                while (rv > 100)
                {
                    rv -= 100;
                }
                if (rv>=1 && rv<=49)
                    rv = currSN;
                else
                    rv = 0 ;
                return rv;
            }
        }
    }
}

Change the code to your needs.