前后台读取Web.config中的值的方法

webconfig

<configuration>
 <appSettings>
 <add key="Workflow_Url" value="http://10.24.126.160/workflowtest/WebService/Services.asmx" />
 </appSettings>

</configuration>

前台:

　　<asp:TextBox ID="ttel2" runat="server" Width="95%" Text='<%$Workflow_Url%>' onFocus=OnEnter(this) onBlur=OnExit(this)></asp:TextBox>

后台:

　　ConfigurationSettings.AppSettings["Workflow_Url"].ToString()