Get Selected Textbox from Dynamically created TextBoxes VB.NET

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VS2012

I have a Dynamically created 100 textboxes on one form in 10X10 format. Similarly i have dynamically created 100 Labels on same form for each textbox.

Working of application is : Application is for lottery center. User will enter values in some textboxes. select rates. and will pay calculated amount.

I divided form controls of 10 rows of 10 controls for easy access for proper naming conventions. Here is the code that i am trying :

As these controls are dynamically created, i am accessing them using code in following snippet.

My Task is : Select the values in textbox on textchanged event from respective textbox, select text from label related to that textbox and put these values in array or database.

Anybody have any idea ?

VB

For Each TextBox As TextBox In pnlNumberContainer.Controls.OfType(Of TextBox)()
        For i As Integer = 0 To 10
            If TextBox.Name = "txtR1C" & i Then
                If Not TextBox.Text = "" Then
                    R1Quantity = R1Quantity + Integer.Parse(pnlNumberContainer.Controls(TextBox.Name).Text)
                    SelectedRate = RateChecker()
                    For Each Label As Label In pnlNumberContainer.Controls.OfType(Of Label)()
                        For j As Integer = 0 To 10
                            If Label.Name = "lblR1C" & j Then
                                If Not TextBox.Text = "" Then
                                    TicketNo = Integer.Parse(pnlNumberContainer.Controls(Label.Name).Text)
                                    ArrayString = TicketNo & "," & Integer.Parse(pnlNumberContainer.Controls(TextBox.Name).Text) & "," & SelectedRate

                                    TicketArray(counter) = ArrayString
                                    counter += 1

                                End If
                            End If
                        Next
                    Next
                End If
            End If
        Next
    Next

Posted 1-Apr-15 2:14am

mrmalkar

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Comments

Kim Togo 1-Apr-15 8:30am

Just hookup with TextChanged for all the TextBox that you create dynamically.
In TextChanged event, there is a "sender as Object". The "sender" will be your TextBox.

mrmalkar 1-Apr-15 8:38am

Hmm, Thanks. I'll try that.

mrmalkar 1-Apr-15 8:42am

Well, sender only gives 4 methods and no constructors. And methods are : Equals, GetHashCode, GetType, ToString.

@Kim : Can you please elaborate some more.

CHill60 1-Apr-15 8:44am

Cast sender as TextBox to get the other properties. You'll have to wire-up the events yourself when creating the textboxes

mrmalkar 1-Apr-15 9:02am

@CHill60 : Yes, i am creating the events myself.

And sure, i'll try by casting sender as TextBox

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CHill60 · Answer 1 · 2015-04-01T03:23:00

Further to the comments here is an example of what we mean

VB

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim currTop As Integer = 10

    For i As Integer = 1 To 10
        Dim t As TextBox = New TextBox()
        t.Top = currTop
        t.Name = "tb" + i.ToString()

        Dim l As Label = New Label()
        l.Top = currTop
        l.Left = t.Left + t.Width + 10
        l.Name = "label" + i.ToString()
        l.Text = l.Name

        currTop += t.Height + 10

        'Wire up a common TextChanged handler
        AddHandler t.TextChanged, AddressOf MyText_TextChanged
        Me.Controls.Add(t)
        Me.Controls.Add(l)
    Next

End Sub

Private Sub MyText_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
    'Get the control as a TextBox so we can access all properties
    Dim tb As TextBox = DirectCast(sender, TextBox)

    'Do whatever with the textbox...
    Dim ln As String = tb.Name
    ln = ln.Replace("tb", "label")

    Console.WriteLine("Text box {0} chosen. Label text is {1}", tb.Name, Me.Controls(ln).Text)
End Sub