The raffle program is not working properly.

Unity Engine
,
1

Hello everyone,
I want to make a raffle program consisting of people selected from an excel table. I have done many things but the giveaway system is not working properly.
For example, let’s do a raffle in which 3 people from a list of 100 people will win. But the winner should not win again. So one person cannot win an award twice. I just couldn’t do this. Sorry for my bad english and terrible software knowledge. Thanks.
Here is the some part of the code

public void RandomFuncNew()//raffle is running...
    {
        WinnerId = Random.Range(1, i + 1);//a random person is selected from the Excel(.csv) table
        Debug.Log(WinnerId);
        Debug.Log(playerList.player[WinnerId - 1].name + " - " +  playerList.player[WinnerId - 1].id);//Print the name and ID number of the selected person
    }

public void RandomFunc()//Main func...
    {
        RandomFuncNew();
if(systemManager.Raffles.Count == 1)//The 1st draw is being held now.
        {
            if(WinnerExcept == true)//the chosen one should not win again
            {
                for(int c = 0; c < systemManager.Lines[0].GetComponent<LineManager>().WinnerNum; c++)//for example, let's have a winner list consisting of 3 people and repeat the cycle 3 times.
                {
                    RandomFuncNew();
                    if(systemManager.Lines[0].GetComponent<LineManager>().WinnerNames.Contains(playerList.player[WinnerId - 1].name))
                    {
                        do
                        {
                            RandomFuncNew();
                            string WN = playerList.player[WinnerId - 1].name;
                            systemManager.Lines[0].GetComponent<LineManager>().WinnerNames[c] = WN;
                        } while (!systemManager.Lines[0].GetComponent<LineManager>().WinnerNames.Contains(playerList.player[WinnerId - 1].name));
                    }
            }
      }
   }
}
2

Finally i fix it, maybe it will be useful for someone.

private int GetUniqueRandomWinner()
    {
        do
        {
            WinnerId = Random.Range(1, i + 1);
        } while (systemManager.Lines[0].GetComponent<LineManager>().WinnerNames.Contains(playerList.player[WinnerId - 1].name)); 

        return WinnerId;
    }

public void RandomFunc()
    {

        if(systemManager.Raffles.Count == 1)
        {
            for(int c = 0; c < systemManager.Lines[0].GetComponent<LineManager>().WinnerNum; c++)
            {

                GetUniqueRandomWinner();
                Debug.Log(WinnerId);
                Debug.Log(playerList.player[WinnerId - 1].name + " - " + playerList.player[WinnerId - 1].id);

                string WN = playerList.player[WinnerId - 1].name;
                systemManager.Lines[0].GetComponent<LineManager>().WinnerNames[c] = WN;
                systemManager.Raffles[0].GetComponent<RaffleManager>().RaffleList[c].GetComponent<WinnerLineManager>().WinnerLineText.text = playerList.player[WinnerId - 1].name + " - " +  playerList.player[WinnerId - 1].id;

            }
              
        }
}