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Monday, May 12, 2008

User Controls

Monday, May 12, 2008 2:01:26 PM (Eastern Standard Time, UTC-05:00) ( ASP.NET )

User controls are somewhat outdated already with the introduction of partial classes in ASP.NET 2.0 but I still find them useful. I think of them similar to the include pages in classic ASP. This is a simple example of how to get the text value from a user control on the parent page.

<%@ Page Language="VB" %>
<%@ Register Src="header.ascx" TagName="header" TagPrefix="uc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

Sub Page_Load(ByVal Src As Object, ByVal E As EventArgs)
    Dim CompanyName As TextBox = CType(Page.FindControl("Header1$txtCompanyName"), TextBox)
    lblCompanyName.Text = CompanyName.Text   
End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <link href="StyleSheet.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <!--This is my user control page header-->
     <uc1:header id="Header1" runat="server"></uc1:header>
     <br />
     <br />
     <asp:Label ID="lblCompanyName" runat="server" Text="Label" />     
     <asp:TextBox ID="TextBox1" runat="server" />    
    </div>
    </form>
</body>
</html>

This is an example of how to set the text value from inside the user control on the parent page.

<%@ Control Language="VB" ClassName="header" EnableViewState="false" %>

<script runat="server">
        
    Private Sub Page_Load(ByVal Src As Object, ByVal E As EventArgs)
        If Not Page.IsPostBack Then                        
            Dim TextBox1 As Textbox =CType(Me.Parent.FindControl("TextBox1"),TextBox)
            TextBox1.Text = "Eat your veggies"            
        End If
    End Sub
</script>
         

<table width="100%" border="0" cellpadding="3" cellspacing="0">
<tr>
    <td>Company: <asp:Textbox ID="txtCompanyName" runat="server" CssClass="textbox" Text="Company Name" ToolTip="Enter a company name" /> 
<asp:Button ID="btnCompanySearch" runat="server" Text="go" CssClass="buttons" OnClick="QuickSearch_Companies_Click" /></td>
     
</tr>    
</table>

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