| <%# ... %> | Executes at the call to DataBind() method. |
| <%= ... %> | Not valid for server controls, will not get executed for server controls. But when place in the mark-up, value get rendered to the output html stream. |
| <%$ Prefix:Value %> | Before page init/At the point of execution. |
Example:
Web.condig:
<appSettings> <add key="Label" value="Expressions"/> </appSettings>
Page:
<%@ Page Language="C#" %> <html> <head id="Head1" runat="server"> <script runat="server"> public string Label = "Expressions"; string a, b, c; protected override void OnInit(EventArgs e) { base.OnInit(e); a = this.txtNameA.Text; /// Expressions b = this.txtNameB.Text; /// "" c = this.txtNameC.Text; /// <%= this.Label %> } protected override void OnLoad(EventArgs e) { a = this.txtNameA.Text; /// Expressions b = this.txtNameB.Text; /// "" c = this.txtNameC.Text; /// <%= this.Label %> base.OnLoad(e); this.DataBind(); a = this.txtNameA.Text; /// Expressions b = this.txtNameB.Text; /// Expressions c = this.txtNameC.Text; /// <%= this.Label %> } protected override void Render(HtmlTextWriter writer) { base.Render(writer); a = this.txtNameA.Text; /// Expressions b = this.txtNameB.Text; /// Expressions c = this.txtNameC.Text; /// <%= this.Label %> } </script> </head> <body> <form id="form1" runat="server"> <asp:TextBox runat="server" ID="txtNameA" Text="<%$ AppSettings:Label %>" /> <asp:TextBox runat="server" ID="txtNameB" Text="<%# this.Label %>" /> <asp:TextBox runat="server" ID="txtNameC" Text="<%= this.Label %>" /> <p><%= this.Label %></p> </form> </body> </html>
Output:
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