Whitelist validation using the FluentValidation library

Most web developers may want to decouple the validation rules from their models and prefer the solution to be written in a unit test-friendly way. You may wish to create your own library that performs whitelisting validation or opt to use a popular and easy-to-use third-party library such as FluentValidation, which has excellent validation features.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder at \Chapter01\input-validation-fluentvalidation\before\OnlineBankingApp.

How to do it…

Let's take a look at the steps for this recipe:

1. Launch Visual Studio Code and open the starting exercise folder by typing the following command:

   code .

2. Navigate to Terminal | New Terminal in the menu or simply press Ctrl + Shift + ' in Visual Studio Code.
3. Type the following command to install the FluentValidation package in your project:

   dotnet add package FluentValidation

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