All,

I just thought this was interesting:

In your InitializeComponent:

this.myTextBox.TextChanged += new System.EventHandler(this.TextBox_Changed);

The event to process:

private void TextBox_TextChanged(object sender, System.EventArgs e)
{
     ((TextBox)sender).ForeColor = System.Drawing.Color.Red;
}

Pretty Simple. Note this does not change the color until after the page has been posted.
Is there a cute way to do this so that the control could generate the JS necessary to do this in RealTime?

Doug