C# Resize textbox to fit content

Question

I\'m writing a program where the user should be able to write text in a textbox. I\'d like the textbox to resize itself, so it fit the content. I\'ve tried the following:

Answer 1

Try this:

using System.Drawing;
...

private void textBoxTitle_TextChanged(object sender, TextChangedEventArgs e)
{
    // Determine the correct size for the text box based on its text length   

    // get the current text box safely
    TextBox tb = sender as TextBox;
    if (tb == null) return;

    SizeF stringSize;

    // create a graphics object for this form
    using(Graphics gfx = this.CreateGraphics())
    {
        // Get the size given the string and the font
        stringSize = gfx.MeasureString(tb.Text, tb.Font);
    }

    // Resize the textbox 
    tb.Width = (int)Math.Round(stringSize.Width, 0);

}

Essentially you create your own Graphics object for the form, then measure it based on the text and font of the TextBox. The using will properly dispose the Graphics object - your previous code would have leaked horribly!