A unique name for the deployment environment. Used in the application URL.
Constraint: Must be from 4 to 23 characters in length. The name can
contain only letters, numbers, and hyphens. It cannot start or end with
a hyphen. This name must be unique in your account. If the specified
name already exists, AWS Elastic Beanstalk returns an CopyC#
InvalidParameterValue
Default: If the CNAME parameter is not specified, the environment name becomes part of the CNAME, and therefore part of the visible URL for your application.

C# |
public string EnvironmentName { get; set; }