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This is of great help when you need to customize an application for a particular user or environment. No code change or compilation is required -- the only thing you have to do is to edit the app.config file.
For example, to change the caption or title of a form "Products" to "Product Details," you would do the following:
Step 1: In the property window, see dyanamic properties. Under this category, click on the advanced property button. A new window will display. Check the text property, and, in key mapping, type any name or leave as default. Then click OK.
Step 2: Now the text property is displayed under dynamic properties. Click in the button along with text property. Check "map property to a key in configuration file." Click OK.
Step 3: Go to app.config file. You can see the entry
<add key="Form1.Text" value="Products" />. To change the caption, modify the value property to "Product Details" before starting the
application. Any change in the app.config is immediatly reflected in the application.
This was first published in May 2003