public string ApplicationName {get; set;}

'Declaration
 
Public Property ApplicationName As String

Property Value

Can be any string of less than 64 characters (in a standard PostgreSQL build). Should include only printable ASCII characters; any other characters will be replaced with question marks (?).The application name will be displayed in the pg_stat_activity view and may be included in the server log entries.

Reference

PgSqlConnectionStringBuilder Class
PgSqlConnectionStringBuilder Members