I am using LINQ to SQL in an ASP.NET project. While inserting the table I need to convert the values to the particular table object and I need to insert.

For that I created a new constructor in that table with parameter so that I can assign my value to that table object , the assign the functionality is working but while inserting (`obj.TS_Questions.InsertOnSubmit(mytableobject);`) I get null exception.

my code::

```
default constructor for my table

public TS_Question()
        {
            this._TS_Options = new EntitySet<TS_Option>(new Action<TS_Option>(this.attach_TS_Options), new Action<TS_Option>(this.detach_TS_Options));
            this._TS_QuestGroups = new EntitySet<TS_QuestGroup>(new Action<TS_QuestGroup>(this.attach_TS_QuestGroups), new Action<TS_QuestGroup>(this.detach_TS_QuestGroups));
            this._TS_QuestRecords = new EntitySet<TS_QuestRecord>(new Action<TS_QuestRecord>(this.attach_TS_QuestRecords), new Action<TS_QuestRecord>(this.detach_TS_QuestRecords));
            this._TS_Admin = default(EntityRef<TS_Admin>);
            this._TS_LevelType = default(EntityRef<TS_LevelType>);
            this._TS_OptionTypeLT = default(EntityRef<TS_OptionTypeLT>);
            OnCreated();
        }

```

---

constructor created by me

```
    public TS_Question(Guid Quest_QuestIDBL, string Quest_NameBL, Nullable<Guid> Quest_OptionTypeIDBL, Guid Quest_AdminIDBL, Guid Ques_LevelIDBL, int Quest_TimeBL, int Quest_MarkBL, string Qest_ExplanationBL, Nullable<bool> Qest_IsMultipleAnswerBL)
    {

        this._TS_Options = new EntitySet<TS_Option>(new Action<TS_Option>(this.attach_TS_Options), new Action<TS_Option>(this.detach_TS_Options));
        this._TS_QuestGroups = new EntitySet<TS_QuestGroup>(new Action<TS_QuestGroup>(this.attach_TS_QuestGroups), new Action<TS_QuestGroup>(this.detach_TS_QuestGroups));
        this._TS_QuestRecords = new EntitySet<TS_QuestRecord>(new Action<TS_QuestRecord>(this.attach_TS_QuestRecords), new Action<TS_QuestRecord>(this.detach_TS_QuestRecords));
        this._TS_Admin = default(EntityRef<TS_Admin>);
        this._TS_LevelType = default(EntityRef<TS_LevelType>);
        this._TS_OptionTypeLT = default(EntityRef<TS_OptionTypeLT>);
        OnCreated();

        this._Quest_QuestID = Quest_QuestIDBL;
        this._Quest_Name = Quest_NameBL; 
        if (Quest_OptionTypeIDBL != null)
        {
            this._Quest_OptionTypeID = Quest_OptionTypeIDBL;
        }
        this._Quest_AdminID = Quest_AdminIDBL;
        this._Ques_LevelID = Ques_LevelIDBL;
        this._Quest_Time = Quest_TimeBL;
        this._Quest_Mark = Quest_MarkBL;
        this._Qest_Explanation = Qest_ExplanationBL;
        this._Qest_IsMultipleAnswer = Qest_IsMultipleAnswerBL;

    }

```

Please help me out from this problem