Question

I’ve seen a couple example of how to do this by placing all the code in the aspx file, but I’m trying to do it from the code-behind. Here’s what I have in the code behind:

    Dim dt As New DataTable

    Using conn As New OleDbConnection(ConnectionString)
        conn.Open()
        Dim dtAdapter As New OleDbDataAdapter
        Dim command As New OleDbCommand("SELECT * FROM table " & _
                                     "" _
                                    , conn)

        dtAdapter.SelectCommand = command
        dtAdapter.Fill(dt)
        conn.Close()
    End Using


    GridView1.DataSource = dt
    GridView1.DataBind()

I’m open to any solutions, but I would prefer to do it in the code-behind if possible since thats how the rest of app is. I dont need to necessarily use a gridview just display some tabular data, so whatever works is fine. Im trying to avoid manually constructing sql strings. Any thoughts?

Answer 1

I don’t see the question. If you don’t kno how to filter the records in your query, use the Where clause with a parameter:

Dim dt = New DataTable()
Using conn As New OleDbConnection(ConnectionString)
    Dim queryString As String = "SELECT * FROM Table WHERE Field1 LIKE ?"
    Dim command As OleDbCommand = New OleDbCommand(queryString, conn)
    command.Parameters.Add("@p1", OleDbType.Char, 3).Value = "a%"
    Using da = New OleDbDataAdapter(command)
        ' you don't need to open/close a connection if you use DataAdapter.Fill
        da.Fill(dt)
    End Using
End Using
GridView1.DataSource = dt
GridView1.DataBind()

• DataAdapter Parameters
• Using Statement