storing data into list<of T>

[Fangling]

Hi, can anyone tell me whether im storing my data into list<of T> correctly? My codes are as follows:

  Dim connect As String
        connect = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" & Application.StartupPath & "\segdata.accdb"
        Dim conn As New OleDbConnection(connect)
        Dim cmd As OleDbCommand = New OleDbCommand
        cmd.Connection = conn
        conn.Open()
        cmd.CommandText = "SELECT DISTINCT AdminNo, ModuleCode FROM(SEGDATA)ORDER BY AdminNo ASC, ModuleCode ASC"
        Dim dt1 As New DataTable
        dt1.Load(cmd.ExecuteReader)
        cmd.CommandText = "SELECT DISTINCT PaperNo,ModuleCode1,ModuleCode2,ModuleCode3, ModuleCode4, ModuleCode5, ModuleCode6, ModuleCode7, ModuleCode8, ModuleCode9 FROM(PapersList)ORDER BY PaperNo ASC"
        Dim dt2 As New DataTable
        dt2.Load(cmd.ExecuteReader)
        'store retrieved modulecode in empty string
        Dim curmodulecode As String = String.Empty
        DataGridView1.AutoGenerateColumns = True
        DataGridView1.DataSource = dt1
        DataGridView2.AutoGenerateColumns = True
        DataGridView2.DataSource = dt2
        'loop first query
        For i As Integer = 0 To dt1.Rows.Count - 1
            Dim j As Integer
            'check if there is modulecode exist, if not, add in
            If DataGridView1.Rows(i).Cells(j).Value Is Nothing Then
                DataGridView1.Rows(i).Cells(j).Value = curmodulecode
            Else
                i = i + 1
            End If
            'Dim x, y As Integer
            'loop through query 2
            Dim MCs As String = String.Empty
            For z As Integer = 0 To dt2.Rows.Count - 1
                Dim y As Integer
                'check if curmodule is found in each row
                If DataGridView2.Rows(z).Cells(y).Value Is Nothing Then
                    DataGridView2.Rows(z).Cells(y).Value = MCs
                End If
                ' store PaperNo, Modulecodes, Students in list(of T)
                Dim mylist As New List(Of Object)
                mylist.Add(DataGridView2.Rows(z).Cells(0).Value)
                mylist.Add(DataGridView1.Rows(i).Cells(0).Value)
                mylist.Add(DataGridView1.Rows(i).Cells(1).Value)

thanks!

[Begginnerdev]

If you know the type of data that is being stored in the datagridviews, just simply declare that type of list:

    'If Data is a String
 Dim myList As New List(Of String)
    'If Data is a integer
 Dim myList As New List(Of Integer)

 mylist.Add(DataGridView2.Rows(z).Cells(0).Value)
 mylist.Add(DataGridView1.Rows(i).Cells(0).Value)
 mylist.Add(DataGridView1.Rows(i).Cells(1).Value)

Then enumerate through the list!

For Each s As String in myList
    'Do Work
Next

For Each i As Integer in myList
    'Do Work
Next

[Fangling]

Hi, i will try on that. thanks!

[Marietjie]

When I'm writing the words in my text box it seems impossible to get the word showing on the document. Im using c#. Can someone help me please.

[Begginnerdev]

You will have to post a new question in the C# forums.
This is a vb.net forum.

The Daniweb rules also state that you can not thread hijack. So, please don't do this.

You can read the rules HERE.