Question

I am creating several text boxes depending on user choice (1-5).How can I access value of programmatic textbox when text changes.

class starts{
    int i=0;

    .....

    TextBox txtb4 = new TextBox();
    txtb4.Name = "textname" + Convert.ToString(i);
    ArrayText.Add(txtb4);
    System.Drawing.Point p5 = new System.Drawing.Point(120, 15);
    txtb4.Location = p5;
    txtb4.Size = new System.Drawing.Size(80, 30);
    txtb4.Text = stringMy;
    grBox1.Controls.Add(txtb4);
    i++;
}

I can access initial textbox text using code below, but I can’t access it after value is changed.

label15.Text = grBox1.Controls["textname0"].Text;

Answer 1

Add an event handler

txtb4.TextChanged += Txtb4_TextChanged;

Declare the handler like this

static void Txtb4_TextChanged(object sender, EventArgs e)
{
    string s = txtb4.Text;
    ...
}    

---

You create textboxes dynamically; however your code looks not very dynamic. Try this

List<TextBox> _textBoxes = new List<TextBox>();
int _nextTextBoxTop = 15;

private void AddTextBox(string initialText)
{
    var tb = new TextBox();
    tb.Name = "tb" + _textBoxes.Count;
    _textBoxes.Add(tb);
    tb.Location = new Point(120, _nextTextBoxTop);
    _nextTextBoxTop += 36;
    tb.Size = new Size(80, 30);
    tb.Text = initialText;
    tb.TextChanged += TextBox_TextChanged
    grBox1.Controls.Add(tb);
}

static void TextBox_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    string s = tb.Text;
    ...
}    

And I would not access textboxes through grBox1.Controls["textname0"].Text;. The textbox list is a better choice, as you can access it through a numeric index instead of a control name

string s = _textBoxes[i].Text;