C#

Calc.tbDisplay = new System.Windows.Forms.TextBox();<br />
<br />
// tbDisplay<br />
// <br />
Calc.tbDisplay.Location = new System.Drawing.Point(136, 56);<br />
Calc.tbDisplay.Name = "tbDisplay";<br />
Calc.tbDisplay.Size = new System.Drawing.Size(208, 20);<br />
Calc.tbDisplay.TabIndex = 18;<br />
Calc.tbDisplay.Text = "0";<br />
Calc.tbDisplay.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;

public class MyTextBox : TextBox {

  public override bool PreProcessMessage(ref Message msg)
  {
    //do your stuff here
  }
}

public class UTF8StringWriter : StringWriter 
{
  public override Encoding Encoding
  {
    get { return System.Text.Encoding.UTF8;}
  }
}

public XmlTextWriter_(TextWriter w, Encoding enc) {
  this = new XmlTextWriter_();
  this.textWriter = w;
  this.encoding = enc;
  this.xmlEncoder = new XmlTextEncoder(w, this.encoding);
  this.xmlEncoder.QuoteChar = this.quoteChar;
}

public class XmlTextWriter_ : System.Xml.XmlTextWriter
{
  ...
  // your constructor here
}