C# is a strongly-typed language that is used for Windows applications. It is a powerful language, and many popular CRM systems have been developed using it. Additionally, C# is a mature language, and there are many libraries and frameworks available to help developers get started quickly.
Java is another popular language used for CRM development. It is a strongly-typed language that is used for developing web applications. One of the main advantages of using Java for CRM is that it is very popular and is used by many large companies, meaning there is a lot of support and resources available.
When it comes to choosing a programming language for a CRM system, it is important to consider the needs of the organization. Each language has its own benefits and drawbacks, so it is important to do some research to find out which language is best for the needs of the organization.