When is the right time to say: "Now I need to create a user control!"

Question

When do you consider creating a user control in .NET? Do you have some basic criteria to exclude your code from the page and introduce a new user control?

Usually I tend to follow those to decide whether I need a user control or not:

• When the page seems to be more readable with a separate user control
• When some part of the form looks like to be used from different pages again and again

Answer 1

I suppose it follows the following:

• Do I need to separate this component out from the common code?
• Do I use this item often, meaning I need to keep recreating it?
• Do I need to be able to template this to suit different styles?