C# textbox cursor positioning

Question

I feel like I am just missing a simple property, but can you set the cursor to the end of a line in a textbox?

    private void txtNumbersOnly_KeyPress(object sender, KeyPressEventArgs e)
{
  if (Char.IsDigit(e.KeyChar) || e.KeyChar == '\b' || e.KeyChar == '.' || e.KeyChar == '-')
  {
    TextBox t = (TextBox)sender;
    bool bHandled = false;
    _sCurrentTemp += e.KeyChar;
    if (_sCurrentTemp.Length > 0 && e.KeyChar == '-')
    {
      // '-' only allowed as first char
      bHandled = true;
    }
    if (_sCurrentTemp.StartsWith(Convert.ToString('.')))
    {
      // add '0' in front of decimal point
      t.Text = string.Empty;
      t.Text = '0' + _sCurrentTemp;
      _sCurrentTemp = t.Text; 
      bHandled  = true;
    }
    e.Handled = bHandled;
  }

After testing for '.' as first char, the cursor goes before the text that is added. So instead of "0.123", the results are "1230." without moving the cursor myself.

I also apologize if this is a duplicate question.

Answer 1

Setting the SelectionStart property on the textbox will control the cursor position.

Answer 2

Assuming you're using WinForms and not WPF...

void SetToEndOfLine(TextBox tb, int line)
{
   int loc = 0;
   for (int x = 0; x < tb.Lines.Length && tb <= line; x++)
   {
      loc += tb.Lines[x].Length;
   }
   tb.SelectionStart = loc;
}

Answer 3

t.SelectionStart = t.Text.Length;