Question

I have several controls in my windows form, namely a Richtextbox and 10 buttons which represents a numpad (from 0-9). When a button is clicked, it will insert the corresponding number into the Richtextbox. I have set the MaxLength property to 6, however i seem to be able to insert more than 6 characters into the textbox by hitting on the buttons. My code is as follows:

private void num1Button_Click(object sender, EventArgs e)
{
    richtextbox.Text = richtextbox.Text.Insert(0, "1");
}

Answer 1

Description

MSDN – Gets or sets the maximum number of characters the user can type or paste into the rich text box control.

So you need to check the length in your code.

Sample

private void num1Button_Click(object sender, EventArgs e)
{
    if (richtextbox.Text.Length >= 6)
        return;
    richtextbox.Text = richtextbox.Text.Insert(0, "1");
}

More Information

• MSDN – RichTextBox.MaxLength Property