C# Programmatically created richtextbox and get text value from button

Question

Hope you can help - I have small issue with code. I have programmatically create rich textbox and text populated from database - which is then added to a panel where I have another button programmatically created.

As displayed:

private void GetPending()
    {
        SQL = "SELECT notID,notNote FROM Notes WHERE notisActive = @notisActive AND notUser = @notuser ";
        y = 3;
        using (SqlConnection SQLCon = new SqlConnection(ConnectionString))
        {
            SqlCommand cmd = new SqlCommand(SQL, SQLCon);
            cmd.Parameters.Add(new SqlParameter("notIsActive", "Pending"));
            cmd.Parameters.Add(new SqlParameter("notUser", lblUserName.Text));

            try
            {
                SQLCon.Open();
                using (SqlDataReader read = cmd.ExecuteReader())
                {
                    while (read.Read())
                    {
                        //Main Panel
                        Panel pnlPendingNote = new Panel();
                        pnlPendingNote.Size = new System.Drawing.Size(315, 110);
                        pnlPendingNote.Location = new Point(3, y);
                        pnlPendingNote.BorderStyle = BorderStyle.FixedSingle;
                        pnlPendingNote.BackColor = Color.FromArgb(244, 244, 244);

             // Button to Activate To Do
                        Button butActivateToDo = new Button();
                        butActivateToDo.Location = new Point(250, 10);
                        butActivateToDo.Size = new System.Drawing.Size(25, 25);
                        butActivateToDo.BackColor = Color.Transparent;
                        butActivateToDo.FlatStyle = FlatStyle.Flat;
                        butActivateToDo.FlatAppearance.BorderSize = 0;
                        butActivateToDo.FlatAppearance.MouseOverBackColor = Color.FromArgb(244, 244, 244);
                        butActivateToDo.Cursor = Cursors.Hand;

                        butActivateToDo.BackgroundImage = ((System.Drawing.Image)(Properties.Resources.Activate_25));
                        pnlPendingNote.Controls.Add(butActivateToDo);

        RichTextBox rxtNotes = new RichTextBox();
                        rxtNotes.Size = new System.Drawing.Size(307, 68);
                        rxtNotes.Location = new Point(3, 37);
                        rxtNotes.Text = (read["notNote"].ToString());
                        rxtNotes.ReadOnly = true;
                        rxtNotes.BorderStyle = BorderStyle.None;
                        rxtNotes.BackColor = Color.FromArgb(244, 244, 244);
                        pnlPendingNote.Controls.Add(rxtNotes);

            pnlPendingNote.Name = "PenNote" + pendingcounter;
                        pnlPendingNote.Tag = read.GetInt32(0);
                        butActivateToDo.Name = "PenNote" + pendingcounter;
                        butActivateToDo.Tag = read.GetInt32(0);
                        rxtNotes.Name = "PenNote" + pendingcounter;
                        rxtNotes.Tag = read.GetInt32(0);

            // Increase by 1
                        pendingcounter++;
                        // Create Double Click
                        butActivateToDo.Click += new EventHandler(NewbutActivateToDo_Click);
                        pnlPendingNote.DoubleClick += new EventHandler(NewPendingButton_DoubleClick);
                        // Add Pending Note size inside Panding Panel
                        pnlPending.Controls.Add(pnlPendingNote);

                        y = y + 112;
                    }
                }
            }
            catch (System.Exception Error)
            {
                MessageBox.Show(Error.Message); // display error - if unable to connect to server
            }
            SQLCon.Close(); // close the sql connection 
        }
    }

Which Works great - i have my panels, textbox and button created.

I then have this code :

 private void NewbutActivateToDo_Click(object sender, EventArgs e)
    {
        Button btn = (Button)sender;
        RichTextBox rxtNotes = (RichTextBox)sender;



        for (int i = 1; i < pendingcounter; i++)
        {
            if (btn.Name == ("PenNote" + i))
            {   

                MessageBox.Show(rxtNotes.Text.ToString());
                break;
            }

        }


    }

Which is working to a degree - it get's what panel i have clicked on & I get the ID which is stored in the tag.

Next I want to get the text value from the text box. So i have added the

RichTextBox rxtNotes = (RichTextBox)sender;

this throws error :

{"Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.RichTextBox'."}

So I would like to get the RtxtBox value when I click a "ActivateToDo" button.

Hope this makes sense -

thanks

Sender of Click event is the Button. To use the RichTextBox in that eent handler, when creating the RichTextBox assign a name to its Name property and then use var rtb = (RichTextBox)this.Controls.Find("the name", true).FirstOrDefault();. — Reza Aghaei
– Reza Aghaei, Commented Dec 3, 2017 at 17:36

JonathanDavidArndt · Accepted Answer · 2018-06-08 14:44:59Z

2

Store a reference to the associated RichTextBox in the Tag() property of your Button:

Button butActivateToDo = new Button();
...
RichTextBox rxtNotes = new RichTextBox();
...
butActivateToDo.Tag = rxtNotes

Now the RichTextBox can be retrieved in the handler:

private void NewbutActivateToDo_Click(object sender, EventArgs e)
{
    Button btn = (Button)sender;
    RichTextBox rxtNotes = (RichTextBox)btn.Tag;

    ...
}

edited Jun 8, 2018 at 14:44

JonathanDavidArndt

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answered Dec 3, 2017 at 18:00

Idle_Mind

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