Validating user input in vb net

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The main form is a windows application form and it contains a few controls necessary to capture the fields needed to properly form the message.

These fields include: The application is simple but could easily be improved by validating each of the required fields through the use of regular expressions or by at least validating that the text associated with each of the text boxes is not an empty string.

This includes the United States and its territories, Canada, Bermuda, and 16 Caribbean nations.

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If you want to limit matches to valid phone numbers according to the North American Numbering Plan, here are the basic rules: Beyond the basic rules just listed, there are a variety of reserved, unassigned, and restricted phone numbers.To maintain the simplicity of the project, little in the way of error handling has been included.The following figure (Figure 1) shows a properly configured collection of input fields in use: Figure 1: The Demonstration Application in Use The System. Mail import brings in the support necessary to transmit the messages generated using the application.In order to begin, unzip the downloaded files and open the project provided.Within the project you will find one main class: frm

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