index number of control array in C#

[Ahmad Sheeraz Saeed]

i am new to C# 2005 i created the array of text boxes like this

numerictextbox1 .NumericTextBox[] PrReading = new numerictextbox1 .NumericTextBox[6];

what i want to know, is it possible for me to display the index number of the text box in which the focus is. for example if i am in first text box the index number will be 0 and if i am in second text box the index number will be 1. I do it this is vb6 but don't know how to do it in c#.

Thanks

[GaryTexmo]

Unless there's a trick I don't know about, the easiest way would be to just search for the selected text box in the array itself. I drew up a quick example using a traditional array and using a list which hooks the Enter event of a TextBox to a method that searches for that textbox in the list.

Hopefully it helps you out.

...
        public const int NUM_TEXTBOXES = 10;
 
        public TextBox[] tbArray = null;
        public List<TextBox> tbList = null;
 
        public Form1()
        {
            InitializeComponent();
 
            tbArray = new TextBox[NUM_TEXTBOXES];
            for (int i = 0; i < tbArray.Length; i++)
            {
                tbArray[i] = new TextBox();
                tbArray[i].Text = "TextBox " + i.ToString();
                tbArray[i].Location = new Point(8, 8 + i * (tbArray[i].Size.Height + 8));
                tbArray[i].Enter += new EventHandler(GenericTBEnterHandler);
            }
 
            foreach (TextBox tb in tbArray)
                this.Controls.Add(tb);
 
            tbList = new List<TextBox>();
            for (int i = 0; i < NUM_TEXTBOXES; i++)
            {
                TextBox newTB = new TextBox();
                newTB.Text = "TextBox (List) " + i.ToString();
                newTB.Location = new Point(tbArray[i].Location.X + tbArray[i].Size.Width + 8, tbArray[i].Location.Y);
                newTB.Enter += new EventHandler(GenericTBEnterHandler2);
                tbList.Add(newTB);
            }
 
            foreach (TextBox tb in tbList)
                this.Controls.Add(tb);
        }
 
        void GenericTBEnterHandler2(object sender, EventArgs e)
        {
            TextBox senderTB = sender as TextBox;
            if (sender != null)
            {
                int index = tbList.IndexOf(senderTB);
                if (index >= 0)
                    Console.WriteLine(string.Format("TextBox (List) at index {0} activated!", index));
            }
        }
 
        void GenericTBEnterHandler(object sender, EventArgs e)
        {
            TextBox senderTB = sender as TextBox;
            if (sender != null)
            {
                int index = -1;
                for (int i = 0; i < tbArray.Length; i++)
                {
                    if (senderTB == tbArray[i])
                    {
                        index = i;
                        break;
                    }
                }
 
                if (index >= 0)
                    Console.WriteLine(string.Format("TextBox at index {0} activated!", index));
            }
        }
...

[Plater]

Is there a particular reason you need to know which textbox is what index?