eliminate the enter key after pressing it in the keyup event of a textbox.

Question

How to cancel a keypress event in a textbox after pressing the return key.

Answer 1

Set the Handled property of KeyPressEventArgs handler parameter to true.

Example from msdn:

private void keypressed(Object o, KeyPressEventArgs e)
{
    if (e.KeyChar == (char)Keys.Return)
    {
        e.Handled = true;
    }
}

See http://msdn.microsoft.com/en-us/library/system.windows.forms.keypresseventargs.handled.aspx for more info.

Answer 2

Do you mean, you want it to ignore the enter key ?

You could add a keydown event and ignore the enter key there...

private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            e.SuppressKeyPress = true;
        }
    }