The underlying connection was closed: The connection was closed unexpectedly

The underlying connection was closed: The connection was closed unexpectedly.

If you are expecting an return from called method and using WCF service, then one possible cause behind this error could be your object serialization/de-serialization problem. If your service method returns something that is not serialize-able then your proxy channel makes this error.

To avoid this, just check-

1. The return type and make sure it is serializable. You may have to put [Serializable] attribute with your class as below:

[DataContract(Namespace = "http://codePattern.net/DataTypes/2013/03", Name = "StudentDetail")]

[Serializable]

public class StudentDetail

{

[DataMember(IsRequired=true)]

public string StudentName { get; set; }

}

IsRequired=true; tells that the value will be present while serilizing ( its says underline property is a non-nullable value type).

2. Make sure your enum values are matched with the values stored inside tables. This is the very critical situation because you don't expect it.