Limit the number of lines in a textbox

Question

It is possible to limit the number of lines in a textbox multiline using C# NET 3.5?

Answer 1

There is no property that limits the number of lines in the TextBox, only the number of characters.

Nothing prevents you from implementing the event KeyDown, making a line count and avoid creating a new one when it reaches the limit.

Assuming you are using winforms:

int maxLines = 3;        
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Enter)
    {
        if (textBox1.Text.Split('\n').Length >= maxLines)
        {
            e.SuppressKeyPress = true;
        }
    }
}

Remembering that it would be necessary to set the property WordWrap for false in order to prevent the TextBox display a new line when the text reaches the end.