generation of unique number

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hi,
im using windows application in c#. i want to generate a ID no in a text box when i run the form first time. while second time, the number generated must be +1 of the old number. can be given condition like between 10000 and 20000.for eg: 00154 for first time means next time when i run the form i want 00155.

Posted 5-Sep-12 6:16am

vijkrnandini

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[no name] 5-Sep-12 12:23pm

Okay so go ahead and do that.

Sergey Alexandrovich Kryukov 5-Sep-12 14:27pm

Why?
--SA

sahabiswarup 6-Sep-12 2:26am

select max(cust_id)+1 as CustID from customer_master where cust_id like '10000%'

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Dave Kreskowiak · Answer 1 · 2012-09-05T07:43:00

Solution 2

The first question would be WHY?

If you're going to use this as a primary key in a table, DON'T!

Posted 5-Sep-12 7:43am

Dave Kreskowiak

sahabiswarup · Answer 2 · 2012-09-05T06:23:00

Here is an example to generate random number as well as string..

Hope it helps you to understand the logic..and you can create whatever condition you want.

StringBuilder builder = new StringBuilder();
        builder.Append(RandomString(4, true));
        builder.Append(RandomNumber(1000, 9999));

Generate random number

private string RandomString(int size, bool lowerCase)
    {
        StringBuilder builder = new StringBuilder();
        Random random = new Random();
        char ch;
        for (int i = 0; i < size; i++)
        {
            ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
            builder.Append(ch);
        }
        if (lowerCase)
            return builder.ToString().ToLower();
        return builder.ToString();
    }

Generate Random Number

private int RandomNumber(int min, int max)
{
    Random random = new Random();
    return random.Next(min, max);
}

You may also apply query to generate serial number

string sqlQuery = "select max(" + colName + ") + 1 from " + tblName;

If you still have any query don't hesitate to ask..
Happy coding.