Timeout expired. The timeout period elapsed prior to completionof the operation or the server is not responding.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
You may be tempted to apply a connection string timeout in the config file however someone pointed out that there is a bug and this value is ignored.
The solution is to set the commandtimeout on the context object.
eg. this.context.CommandTimeout = 180;
Check out the article on stack overflow: entity framework timeouts