Question

I have a very simple error popup I’m trying to make. When I call ShowDialog, all the text in the textbox gets selected. It looks silly. When I break right before ShowDialog, no text is selected. After the call to ShowDialog, all the text is selected without any user interaction.

    static void ShowError(string error)
    {
        var form = new Form
        {
            Text = "Unexpected Error",
            Size = new System.Drawing.Size(800, 600),
            StartPosition = FormStartPosition.CenterParent,
            ShowIcon = false,
            MinimizeBox = false,
            MaximizeBox = false
        };

        var textBox = new TextBox
        {
            Text = error,
            Dock = DockStyle.Fill,
            Multiline = true,
            ReadOnly = true,
        };

        form.Controls.Add(textBox);
        form.ShowDialog();
    }

Answer 1

You can add SelectionStart=0, SelectionLength = 0 or Enabled = false to your textBox creation code