Dynamic textboxes

Question

I am writing a math program for my grand kids. It has a dynamic panel for each add, subtraction. On the Add panel the textbox works correctly. When I add the second panel for subtraction the dynamic textbox returns an empty value. What do I need to do to get the next series of panels to accept textbox input and output? I use textbox txtboxsub = new textbox(); It works fine for the first panel. On the second panel, the textbox.text will not accept input.
Donald Blackburn

Donald Blackburn · Answer

private void Addition_Click(object sender EventArgs e) { AddFuntion(); } private void Subtraction_Click(object sender EventArgs e) { SubtractionFuntion(); } public void AddFuntion() { ComboBoxAdd.Visible = true; pnlWelcome.Visible = false; pnlSummary.Visible = false; pnlSubtraction.Visible = false; pnlAddition.Location = new System.Drawing.Point(250 100); pnlAddition.Name = pnlAddition; pnlAddition.BackColor = Color.LightSkyBlue; pnlAddition.Size = new Size(500 300); pnlAddition.Visible = true; pnlAddition.TabIndex = 0; TextBox textbox1 = new TextBox(); textbox1.Location = new Point(200 10); textbox1.Text = Addition; textbox1.Size = new Size(125 30); txtAddUpperNumb.Location = new Point(400 50); txtAddUpperNumb.Size = new Size(50 30); txtAddLowerNumb.Location = new Point(400 100); txtAddLowerNumb.Size = new Size(50 30); txtAddAnswer.Location = new Point(400 150); txtAddAnswer.Size = new Size(50 30); txtAddCorrect.Location = new Point(400 200); txtAddCorrect.Size = new Size(50 30); txtAddWrong.Location = new Point(400 250); txtAddWrong.Size = new Size(50 30); Label lblAddAnswer = new Label(); lblAddAnswer.Location = new Point(300 150); lblAddAnswer.Text = Answer; Label lblAddNumbCorrect = new Label(); lblAddNumbCorrect.Location = new Point(300 200); lblAddNumbCorrect.Text = Correct; Label lblAddNumbWrong = new Label(); lblAddNumbWrong.Location = new Point(300 250); lblAddNumbWrong.Text = Wrong; Label lblPlusSign = new Label(); lblPlusSign.Location = new Point(410 70); lblPlusSign.Text = +; lblPlusSign.Font = new Font(CenturySchoolBook 24); Button btnAddNextProb = new Button(); btnAddNextProb.Location = new Point(25 100); btnAddNextProb.Text = Next Problem; btnAddNextProb.Size = new Size(125 30); btnAddNextProb.Click += new EventHandler(this.btnAddNextProb_Click); Button btnAddCheckAns = new Button(); btnAddCheckAns.Location = new Point(25 150); btnAddCheckAns.Text = Check Answer; btnAddCheckAns.Size = new Size(125 30); btnAddCheckAns.Click += new EventHandler(this.btnAddCheckAns_Click); Button btnAddClickStarted = new Button(); btnAddClickStarted.Location = new Point(200 100); btnAddClickStarted.Text = Click to get Started; btnAddClickStarted.Size = new Size(140 30); btnAddClickStarted.AutoSize = false; btnAddClickStarted.Click += new EventHandler(this.btnAddClickStarted_Click); pnlAddition.Controls.Add(textbox1); pnlAddition.Controls.Add(txtAddUpperNumb); pnlAddition.Controls.Add(txtAddLowerNumb); pnlAddition.Controls.Add(txtAddAnswer); pnlAddition.Controls.Add(txtAddCorrect); pnlAddition.Controls.Add(txtAddWrong); pnlAddition.Controls.Add(btnAddNextProb); pnlAddition.Controls.Add(btnAddCheckAns); pnlAddition.Controls.Add(btnAddClickStarted); pnlAddition.Controls.Add(lblAddAnswer); pnlAddition.Controls.Add(lblAddNumbCorrect); pnlAddition.Controls.Add(lblAddNumbWrong); pnlAddition.Controls.Add(lblPlusSign); Controls.Add(pnlAddition); pnlAddition.Visible = true; } The application opens to a form. on the form is a combox to select a starting point which is used for all dynamic panels used to create the upper number for the math problem. There are buttons for Addition Subtraction Multiplication and Division. Press one of the buttons which creates a dynamic panel. On the dynamic panel I create textbox for the lower number and the answer. the Addition button works correctly. The Subtraction function as well as all other functions are copies of the Addition function with unique variables for each function. When I press the Subtraction button all of the textboxes are empty which creates runtime errors. Can you help me. I have done some programing I C and VB. I am new to C# and trying to learn a new language. Thank you for your help Donald Blackburn

Nitesh Luharuka · Answer

If you're creating dynamic textboxes in a windows app the values must be retained by the boxes. Make sure you're not disposing the controls and then re-creating them when adding panels. Will it be possible to show some code?

Donald Blackburn · Answer

It is a Windows app. Donald Blackburn

Nitesh Luharuka · Answer

can you explain what you mean by local? You wrote it in C# usikng Windows application or web application?

Donald Blackburn · Answer

This is a local application. It is a math program designed to help my grand kids learn their basic math facts. Donald Blackburn

Nitesh Luharuka · Answer

Is it a web based or windows based application?