How do I save the row values ​​entered in the textbox to the database WPF?

Quote:

I want to save it to the database as it is written one at a time.

private int currentLineLength = 0;
private int lineLengthLimit = 5;
private int currentLineNdx;

// set 'AcceptsTab, and 'MultiLine, to 'true

private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    // measure current line
    currentLineNdx = textBox1.GetLineFromCharIndex(textBox1.SelectionStart);

    currentLineLength = (currentLineNdx == 0)
        ? textBox1.Text.Length
        : textBox1.Lines[currentLineNdx].Length;
    
    // carriage return ?
    if (e.KeyChar == '\r')
    {
        // now CR is okay
        if (currentLineLength == lineLengthLimit)
        {
            currentLineLength = 0;
            return;
        }

        e.Handled = true;
        return;
    }

    // backspace is always ok
    if (e.KeyChar == '\b') return;

    // at the limit for line: cancel
    if (currentLineLength == lineLengthLimit)
    {
        e.Handled = true;
        return;
    }
    
    // numbers always ok
    if (Char.IsDigit(e.KeyChar))
    {
        currentLineLength++;
        return;
    }

    // ignore non-numeric, punctuation, control chars, etc.
    e.Handled = true;
}