diff --git a/src/SqlClient.DesignTime/SqlClientExtensions.fs b/src/SqlClient.DesignTime/SqlClientExtensions.fs
index 06e5a8f4..a210e682 100644
--- a/src/SqlClient.DesignTime/SqlClientExtensions.fs
+++ b/src/SqlClient.DesignTime/SqlClientExtensions.fs
@@ -113,7 +113,7 @@ type internal Routine = {
 
     member this.IsStoredProc = this.Type = StoredProcedure 
     
-    member this.ToCommantText(parameters: Parameter list) = 
+    member this.ToCommandText(parameters: Parameter list) = 
         let twoPartNameIdentifier = sprintf "%s.%s" <|| this.TwoPartName
         match this.Type with 
         | StoredProcedure -> twoPartNameIdentifier
diff --git a/src/SqlClient.DesignTime/SqlClientProvider.fs b/src/SqlClient.DesignTime/SqlClientProvider.fs
index 50044859..05552e16 100644
--- a/src/SqlClient.DesignTime/SqlClientProvider.fs
+++ b/src/SqlClient.DesignTime/SqlClientProvider.fs
@@ -171,7 +171,7 @@ type SqlProgrammabilityProvider(config : TypeProviderConfig) as this =
                         use __ = conn.UseLocally()
                         let parameters = conn.GetParameters( routine, isSqlAzure, useReturnValue)
 
-                        let commandText = routine.ToCommantText(parameters)
+                        let commandText = routine.ToCommandText(parameters)
                         let outputColumns = DesignTime.GetOutputColumns(conn, commandText, parameters, routine.IsStoredProc)
                         let rank = if routine.Type = ScalarValuedFunction then ResultRank.ScalarValue else ResultRank.Sequence
 
diff --git a/src/SqlClient/ISqlCommand.fs b/src/SqlClient/ISqlCommand.fs
index ec6b76a7..dd130fb4 100644
--- a/src/SqlClient/ISqlCommand.fs
+++ b/src/SqlClient/ISqlCommand.fs
@@ -153,11 +153,8 @@ type ``ISqlCommand Implementation``(cfg: DesignTimeConfig, connection: Connectio
                 else
                     sprintf "%s %A" p.ParameterName p.SqlDbType 
              
-            // helper map to resolve each parameter's target type
-            let getSqlDbType = 
-               let lookup = Map.ofSeq <| Seq.zip (parameters     |> Seq.map (fun (name, value) -> name))
-                                                 (cmd.Parameters |> Seq.cast<SqlParameter> |> Seq.map (fun p -> p.SqlDbType))
-               fun name -> Map.find name lookup
+            // helper to resolve each parameter's target type
+            let getSqlDbType (name: string) = cmd.Parameters.[name].SqlDbType
             
             seq {
                 
diff --git a/src/SqlClient/Shared.fs b/src/SqlClient/Shared.fs
index 500354af..1c0e113c 100644
--- a/src/SqlClient/Shared.fs
+++ b/src/SqlClient/Shared.fs
@@ -188,6 +188,7 @@ type [<DataContract;CLIMutable>] Parameter = {
 #endif
 type TempTableLoader(fieldCount, items: obj seq) =
     let enumerator = items.GetEnumerator()
+    let mutable isClosed = false
 
     interface IDataReader with
         member this.FieldCount: int = fieldCount
@@ -197,35 +198,35 @@ type TempTableLoader(fieldCount, items: obj seq) =
             row.[i]
         member this.Dispose(): unit = ()
 
-        member __.Close(): unit = invalidOp "NotImplementedException"
-        member __.Depth: int = invalidOp "NotImplementedException"
-        member __.GetBoolean(_: int): bool = invalidOp "NotImplementedException"
-        member __.GetByte(_ : int): byte = invalidOp "NotImplementedException"
-        member __.GetBytes(_ : int, _ : int64, _ : byte [], _ : int, _ : int): int64 = invalidOp "NotImplementedException"
-        member __.GetChar(_ : int): char = invalidOp "NotImplementedException"
-        member __.GetChars(_ : int, _ : int64, _ : char [], _ : int, _ : int): int64 = invalidOp "NotImplementedException"
-        member __.GetData(_ : int): IDataReader = invalidOp "NotImplementedException"
-        member __.GetDataTypeName(_ : int): string = invalidOp "NotImplementedException"
-        member __.GetDateTime(_ : int): System.DateTime = invalidOp "NotImplementedException"
-        member __.GetDecimal(_ : int): decimal = invalidOp "NotImplementedException"
-        member __.GetDouble(_ : int): float = invalidOp "NotImplementedException"
-        member __.GetFieldType(_ : int): System.Type = invalidOp "NotImplementedException"
-        member __.GetFloat(_ : int): float32 = invalidOp "NotImplementedException"
-        member __.GetGuid(_ : int): System.Guid = invalidOp "NotImplementedException"
-        member __.GetInt16(_ : int): int16 = invalidOp "NotImplementedException"
-        member __.GetInt32(_ : int): int = invalidOp "NotImplementedException"
-        member __.GetInt64(_ : int): int64 = invalidOp "NotImplementedException"
-        member __.GetName(_ : int): string = invalidOp "NotImplementedException"
-        member __.GetOrdinal(_ : string): int = invalidOp "NotImplementedException"
-        member __.GetSchemaTable(): DataTable = invalidOp "NotImplementedException"
-        member __.GetString(_ : int): string = invalidOp "NotImplementedException"
-        member __.GetValues(_ : obj []): int = invalidOp "NotImplementedException"
-        member __.IsClosed: bool = invalidOp "NotImplementedException"
-        member __.IsDBNull(_ : int): bool = invalidOp "NotImplementedException"
-        member __.Item with get (_ : int): obj = invalidOp "NotImplementedException"
-        member __.Item with get (_ : string): obj = invalidOp "NotImplementedException"
-        member __.NextResult(): bool = invalidOp "NotImplementedException"
-        member __.RecordsAffected: int = invalidOp "NotImplementedException"
+        member __.Close(): unit = isClosed <- true
+        member __.Depth: int = raise (NotImplementedException())
+        member __.GetBoolean(_: int): bool = raise (NotImplementedException())
+        member __.GetByte(_ : int): byte = raise (NotImplementedException())
+        member __.GetBytes(_ : int, _ : int64, _ : byte [], _ : int, _ : int): int64 = raise (NotImplementedException())
+        member __.GetChar(_ : int): char = raise (NotImplementedException())
+        member __.GetChars(_ : int, _ : int64, _ : char [], _ : int, _ : int): int64 = raise (NotImplementedException())
+        member __.GetData(_ : int): IDataReader = raise (NotImplementedException())
+        member __.GetDataTypeName(_ : int): string = raise (NotImplementedException())
+        member __.GetDateTime(_ : int): System.DateTime = raise (NotImplementedException())
+        member __.GetDecimal(_ : int): decimal = raise (NotImplementedException())
+        member __.GetDouble(_ : int): float = raise (NotImplementedException())
+        member __.GetFieldType(_ : int): System.Type = raise (NotImplementedException())
+        member __.GetFloat(_ : int): float32 = raise (NotImplementedException())
+        member __.GetGuid(_ : int): System.Guid = raise (NotImplementedException())
+        member __.GetInt16(_ : int): int16 = raise (NotImplementedException())
+        member __.GetInt32(_ : int): int = raise (NotImplementedException())
+        member __.GetInt64(_ : int): int64 = raise (NotImplementedException())
+        member __.GetName(_ : int): string = raise (NotImplementedException())
+        member __.GetOrdinal(_ : string): int = raise (NotImplementedException())
+        member __.GetSchemaTable(): DataTable = raise (NotImplementedException())
+        member __.GetString(_ : int): string = raise (NotImplementedException())
+        member __.GetValues(_ : obj []): int = raise (NotImplementedException())
+        member __.IsClosed: bool = isClosed
+        member __.IsDBNull(_ : int): bool = raise (NotImplementedException())
+        member __.Item with get (_ : int): obj = raise (NotImplementedException())
+        member __.Item with get (_ : string): obj = raise (NotImplementedException())
+        member __.NextResult(): bool = raise (NotImplementedException())
+        member __.RecordsAffected: int = raise (NotImplementedException())
 
 module RuntimeInternals =