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.