Question

This maybe a simple question…I want to disable Minimize/Maximize component from RichTextBox.
I tried to check the properties of RichTextBox, I couldn’t succeed to disable these components.

I want to keep the x close component but I want to disable Minimize/Maximize component from RichTextBox.

  private void button1_Click(object sender, EventArgs e)
        {          
            ShowRichMessageBox(FileSelected, File.ReadAllText(FileSelected));
        }

 private void ShowRichMessageBox(string title, string message)
        {
            RichTextBox rtbMessage = new RichTextBox();

            rtbMessage.Text = message;          

            Form RichMessageBox = new Form();
            RichMessageBox.Text = title;

            RichMessageBox.Controls.Add(rtbMessage);
            RichMessageBox.ShowDialog();
        }

The idea is to display a message in a RichTextBox of the read file.

Answer 1

Use the MinimizeBox and MaximizeBox properties of the Form.
Try this:

private void ShowRichMessageBox(string title, string message)
        {
            RichTextBox rtbMessage = new RichTextBox();

            rtbMessage.Text = message;          

            Form RichMessageBox = new Form();
            RichMessageBox.Text = title;
            RichMessageBox.MaximizeBox = false;
            RichMessageBox.MinimizeBox = false; 

            RichMessageBox.Controls.Add(rtbMessage);
            RichMessageBox.ShowDialog();
        }