System.Web.HttpException: The client disconnected.

You can ignore these exceptions.

The exception says what the problem is: "The client disconnected". It means that the client initiated a request but then disconnected before reading all of the responses. For example, the user closed the browser while the page was loading.

This is an issue at the client end. You can filter them out and ignore them.

An example of exception handling :

 if (ex.Message.StartsWith("The client disconnected")) { // Ignore }