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One way to generate an exception in C# when unable to establish a connection with a remote server is to include a try-catch block around the code that attempts to establish the connection. Within the catch block, a specific exception can be thrown using the "throw" keyword. For example, the following code tries to connect to a remote server and throws a custom exception if the attempt fails:

try { // code to establish connection to remote server } catch (Exception ex) { throw new ConnectionException("Unable to establish connection with remote server.", ex); }

In this example, the catch block catches any exception that occurs while trying to establish the connection. It then throws a new "ConnectionException" with a custom error message and the original exception as the inner exception. The "ConnectionException" class can be defined as a custom exception that extends the "Exception" class and includes additional properties or methods as needed.