USER CONTROL
What is a User Control ? User controls simplify the reuse of code and UI components within a Web application A user control is a user-defined Web server control with an .ascx extension Contains HTML, but not the <HTML>, <BODY>, or <FORM> tags <%@ Control Language="vb" %> OR <%@ Control Language="c#" %> Contains code to handle its own events
Creating a User Control Two methods for user control creation: Create a new user control using Visual Studio .NET Convert an existing ASP.NET page to a user control Host page interacts with the control using properties Host page should use flow layout Public Property pNum() As Integer Get Return Convert.ToInt32(txtNum.Text) End Get Set (ByVal value As Integer) txtNum.Text = CStr(value) End Set End Property public int pNum { get return Convert.ToInt32(txtNum.Text); } set txtNum.Text = Convert.ToString(value);
Adding a User Control Use the @ Register directive to include a user control in an ASP.NET Page <%@ Register TagPrefix="demo" TagName="validNum" Src="numberbox.ascx" %> Insert the user control in a Web Form <demo:validNum id="num1" runat="server"/> Use Get and Set properties of the user control num1.pNum = 5 'uses Set x = num1.pNum 'uses Get OR num1.pNum = 5; //uses Set x = num1.pNum; //uses Get
Why Use User Controls? Application A Application B Reuse user interface and code Application A Control1.ascx Application B Page3.aspx Page1.aspx Page2.aspx