The dataset result seems to be wrong

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Dim y As Integer
For y = 0 To student.Tables(0).Rows.Count.ToString() - 1

    Dim cmd As New SqlCommand("dbo.Test", conn)
    cmd.CommandType = CommandType.StoredProcedure
    cmd.Parameters.AddWithValue("@student_id", student.Tables(0).Rows(y).Item("student_id"))
    cmd.Connection = conn
    Dim studentMark As DataSet = New DataSet()
    Dim da As SqlDataAdapter = New SqlDataAdapter("dbo.Test", conn)
    da.SelectCommand = cmd
    da.Fill(studentMark)

.
.
.

Dim fail As String = "null"

If Not studentMark.Tables(0).Rows.Count.ToString() = 0 Then
    fail = studentMark.Tables(0).Rows(0).Item("studentMark").ToString()
End If

What I have tried:

If the studentMark = fail it will return null but for the result pass it also return null and not "pass"

Posted 17-May-20 15:36pm

Member 14832867

Updated 17-May-20 17:13pm

v4

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MadMyche · Answer 1 · 2020-05-17T16:59:00

Your comparison is between an integer and a string; so this should always be false
"0" != 0

VB

If Not studentMark.Tables(0).Rows.Count.ToString() = 0 Then

Normally I check a DataTable like this to make sure it is not null and has content
Please note: This is C# and based on a DataTable- you will need to adjust

C#

DataTable dt = null;

// populate dt from database

if ((dt != null) && (dt.Rows.Count > 0)) {
  // get the values you need
}