Entity Framework : “The underlying provider failed on Open”

Question

When I try to insert a record, I get this error : The underlying provider failed on Open. This error occurs only with IIS and not with VWD 2008\'s webserver. In the EventViewer

Answer 1

I was getting the same problem and after doing debugging i saw that i am creating the new instance of DB Entity on every action and making new instance of Db Entity means openning new connection with db.

Below is the code :

Private tmpConnection As New DbModel.DbEntities

so by calling the variable again and again its creating new instance of DbEntites and opening new connection to db.

so i write a small function for this and that solved my problem. Now no more error.

Private tmpConnection As DbModel.DbEntities

Public Function dbCon() As DbModel.DbEntities

    If tmpConnection IsNot Nothing Then

        If tmpConnection.Connection.State = ConnectionState.Closed Then

            Try
                tmpConnection.Connection.Open()
                Return tmpConnection
            Catch ex As Exception
                My.Response.Redirect("dberror.aspx")
            End Try

        Else

            Return tmpConnection

        End If

    Else

        tmpConnection = New DbModel.DbEntities

        Try
            tmpConnection.Connection.Open()
            Return tmpConnection
        Catch ex As Exception
            My.Response.Redirect("dberror.aspx")
        End Try

    End If

    Return Nothing
End Function

and last thing in your connectionstring please add "Connect Timeout=30;"

thats working so perfect for me