winforms - Change cursor position in textbox in C# Windows

Question

I have a winform which load MDI child winform. All textboxs in child winform always have cursor stay at left side and I can't move it to another position, except I choose all text and re-input. How can I enable this to make cursor can stay at any position by using mouse?

Answer 1

In the following example the cursor will be positioned after the second character in each textbox of the form. The focus will be on the last one, but by pressing the TAB key repeatedly, you can verify that the cursor position has been set for every textbox.

using System;
using System.Windows.Forms;

public class Program
{
  public static void Main()
  {
    var form = new Form();
    form.Text = "Cursor Positioning Test";
    form.Visible = true;
    form.Shown += delegate(object sender, EventArgs args) {
      foreach (var control in form.Controls)
      {
        var textBox = control as TextBox;
        if (textBox != null)
        {
          textBox.Focus();
          textBox.SelectionStart = 2;
          textBox.SelectionLength = 0;
        }
      }
    };

    var textBox1 = new TextBox();
    textBox1.Text = "hello";
    textBox1.Left = 10;
    textBox1.Top = 10;
    form.Controls.Add(textBox1);

    var textBox2 = new TextBox();
    textBox2.Text = "stack";
    textBox2.Left = 10;
    textBox2.Top = 10 + textBox1.Height + 10;
    form.Controls.Add(textBox2);

    var textBox3 = new TextBox();
    textBox3.Text = "overflow";
    textBox3.Left = 10;
    textBox3.Top = 10 + textBox1.Height + 10 + textBox2.Height + 10;
    form.Controls.Add(textBox3);

    Application.Run(form);
  }
}