Textbox array does not update in a User Control

Question

Hello everyone, I am attempting to build a User Control with a collection of TextBoxes. The idea is to be able to display a collection of information. I can get a single Textbox to update, but I just can't get an array to do the same thing. The function _aTextBox() is called from 2 buttons on my main program as follows: private void button1_Click(object sender, EventArgs e) { ucTextBox1._aTextBox( "Hello" ,0); } private void button2_Click(object sender, EventArgs e) { ucTextBox1._aTextBox( "World" ,1); } Any and all suggestions welcomed . Many thanks for your time reading this. My User Control code is below: At the line marked with // *********************, txt[0].Text holds the correct string. However, it never displays it!!! namespace ucTextBox { public partial class ucTextBox: UserControl { public ucTextBox() { InitializeComponent(); } TextBox[] txt = new TextBox[2]; private void DisplayTextBoxes() { txt[0] = new TextBox(); txt[0].Location = new System.Drawing.Point(20, 48); this .Controls.Add(txt[0]); } public void _aTextBox( string text) { DisplayTextBoxes(); txt[0].Visible = false ; txt[0].Text = text; // ********************* txt[0].Visible = true ; txt[0].Invalidate(); txt[0].Update(); txtValue.Visible = true ; txtValue.Text = text; txt[0].ResumeLayout( true ); } } }

theLizard · Answer

Try this public partial class ucTextBox : UserControl { int index; Point p; public ucTextBox() { InitializeComponent(); } private void ucTextBox_Load( object sender, EventArgs e) { p.X = 0; p.Y = 4; } TextBox[] txt = new TextBox[0]; private void DisplayTextBoxes() { Array.Resize( ref txt, txt.Length +1); index = txt.Length - 1; txt[index] = new TextBox(); txt[index].Location = new System.Drawing.Point(p.X, p.Y); p.Y = p.Y + txt[index].Height + 5; this .Controls.Add(txt[index]); } public void _aTextBox( string text) { DisplayTextBoxes(); txt[txt.Length - 1].Visible = false ; txt[txt.Length - 1].Text = text + txt.Length.ToString(); // ********************* txt[txt.Length - 1].Visible = true ; txt[txt.Length - 1].Invalidate(); txt[txt.Length - 1].Update(); txt[txt.Length - 1].ResumeLayout( true ); } } If you want to arrange the text boxes into columns, you will need to count the # of text boxes you want per column then change the p.X value to start a new coulm n and reset the p.Y back to the start pos of 1st text box in column.