Question

Sorry for the newbie question. Could someone help me out? Simple array here. What’s the best/easiest method to check all the user input is unique and not duplicated? Thanks

    private void btnNext_Click(object sender, EventArgs e)
    {

        string[] Numbers = new string[5];


        Numbers[0] = txtNumber1.Text;
        Numbers[1] = txtNumber2.Text;
        Numbers[2] = txtNumber3.Text;
        Numbers[3] = txtNumber4.Text;
        Numbers[4] = txtNumber5.Text;


        foreach (string Result in Numbers)
        {
            lbNumbers.Items.Add(Result);
        }

        txtNumber1.Clear();
        txtNumber2.Clear();
        txtNumber3.Clear();
        txtNumber4.Clear();
        txtNumber5.Clear();
    }
}

}

I should have added I need to check to happen before the numbers are output. Thanks

Answer 1

One simple approach is via LINQ:

bool allUnique = Numbers.Distinct().Count() == Numbers.Length;