Duplicate QuestionName in a loop

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Hi, I have the following codes in which I will have a loop. For example, I have 2 different records, let say "Hello" and "HelloWorld" inside my DtoList. But somehow the "Hello" and "HelloWorld" will duplicate themselves and have 2 records for each off them.
Which means total of 4 records inside my dtolist.
Therefore, everytime the "tvQuestionList" is refreshed, it will displays total of 4 records instead of 2 records.
How can I change the codes logic below to make it become only 2 records to be displayed?
Below are my codes:

C#

private void PopulateQuestionTree(bool isDelete)
{
    tvQuestionList.BindingContext = null;
    tvQuestionList.Nodes.Clear();
    CustomDataCollectionQuestionDtoList questionList = new CustomDataCollectionQuestionDtoList();
    questionList.DtoList = _customDataCollectionQuestionList.DtoList.Where(q =>
        q.TrackingState != BaseDto.TrackingInfo.Deleted).OrderBy(q => q.Sequence).ToList();
    for (int i = 0; i < questionList.DtoList.Count; i++)
    {  
         tvQuestionList.Nodes.Insert(i, CreateTreeNode(questionList.DtoList[i], i));       
    }
    tvQuestionList.Refresh();
}

Posted 18-May-15 22:55pm

Jamie888

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Jamie888 19-May-15 4:58am

FYI, I have checked through the SQL database. The records indeed are correct. Only one "Hello" and one "HelloWorld".

Mycroft Holmes 19-May-15 5:04am

Have you checked what the count of DtoList is when you start the loop.

Jamie888 19-May-15 5:09am

yup, it is 4. I feel weird though. Is it because of the "questionList.DtoList = _customDataCollectionQuestionList.DtoList.Where(q =>
q.TrackingState != BaseDto.TrackingInfo.Deleted).OrderBy(q => q.Sequence).ToList();" ?

Jamie888 19-May-15 5:14am

Sir, FYI, the sequence for the results are "Hello", "Hello", "HelloWorld", "HelloWorld". Could I add a if(i%2 == 0){tvQuestionList.Nodes.Insert(i, CreateTreeNode(questionList.DtoList[i], i));} ?

Matt T Heffron 19-May-15 12:49pm

I'd unroll the filling of questionList.DtoList so I could step through it with the debugger to see what is really happening.

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abhishek4official · Answer 1 · 2015-05-18T23:10:00

C#

private void PopulateQuestionTree(bool isDelete)
{
    tvQuestionList.BindingContext = null;
    tvQuestionList.Nodes.Clear();
    CustomDataCollectionQuestionDtoList questionList = new CustomDataCollectionQuestionDtoList();
    questionList.DtoList = _customDataCollectionQuestionList.DtoList.Where(q =>
        q.TrackingState != BaseDto.TrackingInfo.Deleted).OrderBy(q => q.Sequence).ToList();
    for (int i = 0; i < questionList.DtoList.Count; i++)
    {
           if(tvQuestionList.Nodes.Contains(x=>x.Name!=questionList.DtoList[i].Name)
         tvQuestionList.Nodes.Insert(i, CreateTreeNode(questionList.DtoList[i], i));
    }
    tvQuestionList.Refresh();
}