Form to Form Communications

pjtraynor · May 19th, 2009, 04:07 PM

Here's my (simple?) VB 2005 problem:

I need to update a NumericUpDown control on FormA from FormB

I've tried running this from frmB:

MySolution.frmA.nud1.Value = intNewValue

I've also tried creating the following subroutine on frmA:

Friend Sub UpdateNud(ByVal intNewValue As Integer)
Me.nud1.Value = intNewValue
End Sub

Both options run without complaint but neither changes the value. I've searched through stacks of literature but haven't yet found a solution. Any help would be appreciated.

Lee Dumond · May 20th, 2009, 12:02 AM

Have you tried cross-posting from form B to form A?

pjtraynor · May 20th, 2009, 12:24 PM

Sorry, I'm not sure what that means so I guess the answer must be no.

Regards,
Pete

Lee Dumond · May 20th, 2009, 01:31 PM

Form A markup:

Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FormA.aspx.cs"
   Inherits="FormA" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit"
   TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Form A</title>
</head>
<body>
   <form id="form1" runat="server">
      <div>
         <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" />
         <asp:TextBox ID="TextBox1A" runat="server" />
         <cc1:NumericUpDownExtender ID="TextBox1_NumericUpDownExtender"
            runat="server" Enabled="True" Maximum="1.7976931348623157E+308"
            Minimum="0" TargetControlID="TextBox1A" Width="100">
         </cc1:NumericUpDownExtender>
      </div>
   </form>
</body>
</html>

Form A code-behind:

Code:

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class FormA : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       if (PreviousPage != null)
       {
          TextBox1A.Text = ((TextBox) PreviousPage.FindControl("TextBox1B")).Text;
       }
    }
}

Form B markup:

Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FormB.aspx.cs"
   Inherits="FormB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Form B</title>
</head>
<body>
   <form id="form1" runat="server">
      <div>
         <p>
            Put an integer in the textbox below, and click the button to
            cross-post it to Form A.
         </p>
         <asp:TextBox ID="TextBox1B" runat="server" />
         <asp:Button ID="Button1" runat="server" Text="Post" PostBackUrl="FormA.aspx" />
      </div>
   </form>
</body>
</html>

pjtraynor · May 20th, 2009, 01:45 PM

That's very helpful - Thanks!