C# random numbers from int array

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Good day all.
Let me start by saying I am missing something obvious and I know, but cant seem to get it.
I am working on a randomization application.
I need to pull a list of active users(with USERID's) from my database, load them into a Datagridview, Well that works fine, now after that I load the USERID's into a int[], also works fine. Now my problem is that I need to loop these USERID's into a random function and populate a different Datagridview with it and the random is only supposed to select USERID's in the array.
This is how far I have gotten.

conn.Open();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < select.Length; i++)
            {
                ds = new DataSet();
                int use = Users.Next(15, Int32.Parse(select.GetValue(i).ToString()));
                if (select.Contains(use))
                {
                    sb.Append(use + "\r\n");
                    da = new SqlDataAdapter("SELECT USERID,FULLNAME FROM USERS WHERE TYPE = 'EMPLOYEE' AND ACTIVE = 'True' AND USERID ='" + use + "' ORDER BY USERID", conn);

                }                
            }
            
            build = new SqlCommandBuilder(da);
            da.Fill(ds, "USERS");
            dgSelected.DataSource = ds;
            dgSelected.DataMember = "USERS";
            conn.Close();

select is the int[]

Any help please?

Posted 23-Jul-13 3:02am

BulletVictim

Updated 23-Jul-13 3:20am

v2

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OriginalGriff · Answer 1 · 2013-07-23T05:02:00

The way I do it is not to use an array but a List instead:

C#

List<int> newOrder = new List<int>();
while (users.Count > 0)
    {
    int removeIndex = rand.Next(users.Count)
    newOrder.Add(users[removeIndex]);
    users.RemoveAt(removeIndex);
    }

What this does is select an item at random, and then remove it so it can't be repeated.