vb.net finding a row in a dataset with a column value

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I am trying to find a row in a dataset with a column value. The column is a boolean data type.

VB

 Dim foundRows() As Data.DataRow
foundRows = dsans.Tables(0).Select("correct_ans = 'true'")
               Dim j As Integer
               Dim iRowIndex As Integer
               For j = 0 To dtans.Rows.Count - 1
                   If dtans.Rows(j).Equals(foundRows) Then
                       iRowIndex = j
                       Exit For
                   End If
               Next
               answer = dtans.Rows(iRowIndex).Item(1)

Everytime it returns the first row.It is not checking the condition
correct_ans = 'true'. Is anything wrong in the select statement?

Posted 29-Aug-11 18:51pm

jrameshan

Updated 29-Aug-11 18:53pm

Prerak Patel

v2

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Prerak Patel · Answer 1 · 2011-08-29T18:58:00

Solution 1

If it is boolean, simply try this.

VB

dsans.Tables(0).Select("correct_ans") ' or "NOT correct_ans"

Your comparison is for string types, not for boolean.
[Edit]
I really missed this part when I found problem at first.

VB

For j = 0 To dtans.Rows.Count - 1
  If dtans.Rows(j).Equals(foundRows) Then
    iRowIndex = j
    Exit For
  End If
Next

foundRows is array of DataRow. What you are trying to is to equate DataRow to it.

Posted 29-Aug-11 18:58pm

Prerak Patel

Updated 29-Aug-11 19:50pm

v3

Comments

jrameshan 30-Aug-11 1:10am

select("correct_ans")didn't work.It is again returning the first row. Not sure if I can use select("NOT correct_ans") because I have 3 rows which are false and only one row which is true.

Prerak Patel 30-Aug-11 1:50am

Debug and find the bug. Your logic seems wrong to me. Updated the answer.

Abhinav S · Answer 2 · 2011-08-29T19:51:00

Solution 2

What is the type of the correct_ans field. Is it boolean or string?

The comparison you are doing here is essentially a string so there are no results returned if the types are not matching.

Posted 29-Aug-11 19:51pm

Abhinav S

v2