Dynamic textboxes

        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

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Donald Blackburn10y ago
        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 Kejriwal10y ago
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 Blackburn10y ago
It is a Windows app. Donald Blackburn
Nitesh Kejriwal10y ago
can you explain what you mean by local? You wrote it in C# usikng Windows application or web application?
Donald Blackburn10y ago
This is a local application. It is a math program designed to help my grand kids learn their basic math facts.
Donald Blackburn
Nitesh Kejriwal10y ago
Is it a web based or windows based application?