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user control on a web page that uses a master page.

CroCrew
564 Expert 512MB
Hello everyone,

First let me say thanks to anyone that post an answer to my question.

Let me explain the what I am trying to do. The code below is an example and try to keep all answers within the five pages that I have posted. I did not want to post the complex version of my code because I think if this gets solved then others can use the simplest version of this question and apply it to their solutions.
  1. I want a user control (WebUserControl.ascx) on a web page (Home.aspx) that uses a master page (MasterPage.master).
  2. There is a button on the user control (WebUserControl.ascx) that will do a calculation within the code behind of the user control (WebUserControl.ascx.cs).
  3. There is a “Label” on the web page (Home.aspx) that I want updated to show the calculated value from “TextBox3” in the user control (WebUserControl.ascx) after the button in the user control (WebUserControl.ascx) has been clicked.

I have tried and tried but could not find an elegant way of doing this. Any ideas? Below is the code.

**MasterPage.master**
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  1. <%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
  2. <!DOCTYPE html>
  3. <html xmlns="http://www.w3.org/1999/xhtml">
  4. <head runat="server">
  5.     <title></title>
  6.     <asp:ContentPlaceHolder id="head" runat="server">
  7.     </asp:ContentPlaceHolder>
  8. </head>
  9. <body>
  10.     <form id="form1" runat="server">
  11.     <div>
  12.         Add it up!<br />
  13.         <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
  14.  
  15.         </asp:ContentPlaceHolder>
  16.     </div>
  17.     </form>
  18. </body>
  19. </html>
  20.  
**Home.aspx**
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  1. <%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Home.aspx.cs" Inherits="Home" %>
  2. <%@ Register TagPrefix="Math" TagName="AddControl" Src="~/WebUserControl.ascx" %>
  3. <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
  4.     <asp:Label ID="Label1" runat="server" Text="Label">Display the value from control here!</asp:Label><br />
  5.     <Math:AddControl ID="CoolMath" runat="server" />
  6. </asp:Content>
  7.  
**Home.aspx.cs**
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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.UI;
  6. using System.Web.UI.WebControls;
  7.  
  8. public partial class Home : System.Web.UI.Page
  9. {
  10.     protected void Page_Load(object sender, EventArgs e)
  11.     {
  12.  
  13.     }
  14. }
  15.  
**WebUserControl.ascx**
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  1. <%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>
  2. <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
  3. <asp:TextBox ID="TextBox1" runat="server" /> + 
  4. <asp:TextBox ID="TextBox2" runat="server" /> = 
  5. <asp:TextBox ID="TextBox3" runat="server" />
  6.  
**WebUserControl.ascx.cs**
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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.UI;
  6. using System.Web.UI.WebControls;
  7.  
  8. public partial class WebUserControl : System.Web.UI.UserControl
  9. {
  10.     protected void Page_Load(object sender, EventArgs e)
  11.     {
  12.  
  13.     }
  14.  
  15.     protected void Button1_Click(object sender, EventArgs e)
  16.     {
  17.         Int32 Val1 = Int32.Parse(TextBox1.Text.ToString());
  18.         Int32 Val2 = Int32.Parse(TextBox2.Text.ToString());
  19.  
  20.         TextBox3.Text = (Val1 + Val2).ToString();
  21.     }
  22. }
  23.  

Please help and thanks you!
CroCrew~
Jul 13 '13 #1

✓ answered by Frinavale

First you need your custom event args:
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  1. public class TCalculationEventArgs : EventArgs
  2. {
  3.   public string Result{get; set;}
  4.   public TCalculationEventArgs(string result){
  5.     this.Result = result;
  6.   }
  7. }
  8.  
Then in your WebUserControl declare a public "event" for the class that can be handled by your main window. In the button click event, do your calculation and raise the new event.

**WebUserControl.ascx.cs**
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  1. using Microsoft.VisualBasic;
  2. using System;
  3. using System.Collections;
  4. using System.Collections.Generic;
  5. using System.Data;
  6. using System.Diagnostics;
  7. using System.Linq;
  8. using System.Web;
  9. using System.Web.UI;
  10. using System.Web.UI.WebControls;
  11.  
  12. public partial class WebUserControl : System.Web.UI.UserControl
  13. {
  14.  
  15.     public event CalculationCompletedEventHandler CalculationCompleted;
  16.     public delegate void CalculationCompletedEventHandler(object sender, TCalculationEventArgs e);
  17.  
  18.     protected void Page_Load(object sender, EventArgs e)
  19.     {
  20.     }
  21.  
  22.     protected void Button1_Click(object sender, EventArgs e)
  23.     {
  24.         Int32 Val1 = Int32.Parse(TextBox1.Text.ToString());
  25.         Int32 Val2 = Int32.Parse(TextBox2.Text.ToString());
  26.  
  27.         TextBox3.Text = (Val1 + Val2).ToString();
  28.  
  29.         if (CalculationCompleted != null) {
  30.             CalculationCompleted(this, new TCalculationEventArgs((Val1 + Val2).ToString()));
  31.         }
  32.     }
  33. }

Then in your home page, handle the event for the User Control.

**Home.aspx.cs**
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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.UI;
  6. using System.Web.UI.WebControls;
  7.  
  8. public partial class Home : System.Web.UI.Page
  9. {
  10.     protected void Page_Load(object sender, EventArgs e)
  11.     {
  12.  
  13.     }
  14.  
  15.     private void CoolMath_CalculationCompleted(object s, TCalculationEventArgs e)
  16.     { //make sure to do the necessary hook up to add the handler (I am not great with C# syntax and events)
  17.         Label1.Text = e.Result;
  18.     }
  19. }
  20.  
-Frinny

10 8035
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  1. <%@ PreviousPageType VirtualPath="~/default.aspx" %>
On page written to
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  1. Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  2.         If PreviousPage IsNot Nothing AndAlso PreviousPage.IsCrossPagePostBack Then
  3.             Label1.Text = ("Results For : " & PreviousPage.Droplist1.SelectedValue)
  4.         Else
  5.             Response.Redirect("default.aspx")
  6.  
  7.         End If
on the back end side

Hopes this helps
Jul 13 '13 #2
CroCrew
564 Expert 512MB
Thanks for the reply Dan. Can you please describe your solution and how it would work?

Thanks,
CroCrew~
Jul 13 '13 #3
In my form user pick from select combo box and is control to search database, with goes to results page .. Where the select item will read in labeltext ,here with code link to pages together , second is on second page.vb this code permits look up... I know it is not C# but maybe it will give you a ideal ..
Jul 13 '13 #4
CroCrew
564 Expert 512MB
Thanks Dan.

But if I have to hard code in the control a path to a webpage then that takes away from the control being portable.

Any other idea?
Jul 14 '13 #5
CroCrew
564 Expert 512MB
Also I am looking for a solution that will fit within the five pages that I posted above. Answers can be in VB or C#.

Thanks everyone.

CroCrew~
Jul 14 '13 #6
Frinavale
9,735 Expert Mod 8TB
CroCrew,

Just have your user control raise an event once it is finished doing it's calculation. Use a customized EventArgs to pass the result of it's calculation to the code that handles the event.

In your webpage, simply add a handler for the "CalculationCompleted" event that your user control raises. In that code, retrieve the result from the EventArgs, and display it.

One question: how does the master page fit into what you were describing?

The solution will have to be modified a bit if you want to display the result in your master page.

-Frinny
Jul 15 '13 #7
CroCrew
564 Expert 512MB
Frinavale,

Thanks for the reply. In my example the master page is only for adding another level of complexity. Nothing will get updated on the master page.

Can you provide an example of what you are suggesting for the webpage?

Thanks,
CroCrew~
Jul 15 '13 #8
Frinavale
9,735 Expert Mod 8TB
First you need your custom event args:
Expand|Select|Wrap|Line Numbers
  1. public class TCalculationEventArgs : EventArgs
  2. {
  3.   public string Result{get; set;}
  4.   public TCalculationEventArgs(string result){
  5.     this.Result = result;
  6.   }
  7. }
  8.  
Then in your WebUserControl declare a public "event" for the class that can be handled by your main window. In the button click event, do your calculation and raise the new event.

**WebUserControl.ascx.cs**
Expand|Select|Wrap|Line Numbers
  1. using Microsoft.VisualBasic;
  2. using System;
  3. using System.Collections;
  4. using System.Collections.Generic;
  5. using System.Data;
  6. using System.Diagnostics;
  7. using System.Linq;
  8. using System.Web;
  9. using System.Web.UI;
  10. using System.Web.UI.WebControls;
  11.  
  12. public partial class WebUserControl : System.Web.UI.UserControl
  13. {
  14.  
  15.     public event CalculationCompletedEventHandler CalculationCompleted;
  16.     public delegate void CalculationCompletedEventHandler(object sender, TCalculationEventArgs e);
  17.  
  18.     protected void Page_Load(object sender, EventArgs e)
  19.     {
  20.     }
  21.  
  22.     protected void Button1_Click(object sender, EventArgs e)
  23.     {
  24.         Int32 Val1 = Int32.Parse(TextBox1.Text.ToString());
  25.         Int32 Val2 = Int32.Parse(TextBox2.Text.ToString());
  26.  
  27.         TextBox3.Text = (Val1 + Val2).ToString();
  28.  
  29.         if (CalculationCompleted != null) {
  30.             CalculationCompleted(this, new TCalculationEventArgs((Val1 + Val2).ToString()));
  31.         }
  32.     }
  33. }

Then in your home page, handle the event for the User Control.

**Home.aspx.cs**
Expand|Select|Wrap|Line Numbers
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Web;
  5. using System.Web.UI;
  6. using System.Web.UI.WebControls;
  7.  
  8. public partial class Home : System.Web.UI.Page
  9. {
  10.     protected void Page_Load(object sender, EventArgs e)
  11.     {
  12.  
  13.     }
  14.  
  15.     private void CoolMath_CalculationCompleted(object s, TCalculationEventArgs e)
  16.     { //make sure to do the necessary hook up to add the handler (I am not great with C# syntax and events)
  17.         Label1.Text = e.Result;
  18.     }
  19. }
  20.  
-Frinny
Jul 15 '13 #9
CroCrew
564 Expert 512MB
Frinavale,

Thank you very much for your help. Great looking example!

Thanks,
CroCrew~
Jul 15 '13 #10
Frinavale
9,735 Expert Mod 8TB
No problem :)

-Frinny
Jul 15 '13 #11

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