Question

Here’s what I had so far, code-wise:

Protected Sub btnAddRow7_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnAddRow7.Click

    Dim tableRow As New System.Web.UI.WebControls.TableRow
    Dim tableCell As New System.Web.UI.WebControls.TableCell
    Dim textBox As New System.Web.UI.WebControls.TextBox

    tableCell.Controls.Add(textBox)

    tableRow.Cells.Add(tableCell)

    tbl7.Rows.Add(tableRow)

End Sub

…but it only adds one row dynamically. After the first addition, more clicks to the button will not add more rows. Any idea why? Better way to do this?

Answer 1

You could rebuild your Table in Page.Load. For example:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    rebuildMyTable()
End Sub

Private Sub rebuildMyTable()
    If Me.ViewState("TableRowCount") Is Nothing Then Me.ViewState("TableRowCount") = 0
    For i As Int32 = 0 To CInt(Me.ViewState("TableRowCount")) - 1
        AddTableRow()
    Next
End Sub

Private Sub AddTableRow()
    Dim tableRow As New System.Web.UI.WebControls.TableRow
    Dim tableCell As New System.Web.UI.WebControls.TableCell
    Dim textBox As New System.Web.UI.WebControls.TextBox

    tableCell.Controls.Add(textBox)

    tableRow.Cells.Add(tableCell)

    Me.MyTable.Rows.Add(tableRow)
End Sub

Protected Sub BtnAddRow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnAddRow.Click
    AddTableRow()

    If Me.ViewState("TableRowCount") Is Nothing Then
        Me.ViewState("TableRowCount") = 1
    Else
        Me.ViewState("TableRowCount") = CInt(Me.ViewState("TableRowCount")) + 1
    End If
End Sub

This is because the Button Event comes after the Viewstate is registered.
http://msdn.microsoft.com/en-us/library/ms178472.aspx