What kind of tutorial are you expecting?
Create your form in design view.
Add a TextBox control.
Highlight it.
Select Events in the properties window.
Scroll to the Click event.
Double click it.
Add code to handle the click.
Or:
Add a handler to your textbox:
textBox1.Click += new EventHandler(textBox1_Click);
and provide the handler:
void textBox1_Click(object sender, EventArgs e)
{
throw new NotImplementedException();
}
Then code your handler so it doesn't throw an exception...
Or was there something else?