C#

<br />
textbox1.enter += new EventHandler(myEventHandler);<br />
textbox2.enter += new EventHandler(myEventHandler);<br />
public void myEventHandler(object sender,EventArg e)<br />
{<br />
/*  you could skip this and just use it like<br />
    ((TextBox)sender).Name<br />
*/<br />
  TextBox tmpBox = (TextBox)sender;<br />
  if(tmpBox.Name == "textbox1")<br />
  {<br />
    //2400, 2800<br />
  }<br />
  else<br />
  {<br />
     //1800, 2200 <br />
  }<br />
}<br />

this.yearBuiltTextBox.Enter += new EventHandler(Parse_TextBox);
this.yearRenovateTextBox.Enter += new EventHandler(Parse_TextBox);

void ParseTextBox(object sender, EventArgs e)
{
 TextBox tbSender = (TextBox)sender;
 if(sender.Enabled == false)
 {
  return;
 }


 int min, max;
 if(tbSender == this.yearBuiltTextBox)
 {
  min = 1800;
  max = 2200;
 }
 else
 {
  min = 2400;
  max = 2800;
 }

 object parseValue = DataFormatter.ParseInteger(this.yearBuiltTextBox.Text, min, max);
}