Suppose we have the followings on our web.config file:
  1. <appSettings>
  2. <add key="serverip" value="###.##.#.##"/>
  3. </appSettings>
  4. <connectionStrings>
  5. <add name="conn" connectionString="Server=###.##.#.##;User=root;Password=12345;Database=test;"/>
  6. </connectionStrings>
Then using the following set of steps we can read our config file.
Step 1:- Add the following piece of code in the head section of .aspx page.
  1. <script type="text/javascript">
  2. function ReadConfigFile()
  3. {
  4. var conStr = '<%=ConfigurationManager.ConnectionStrings["conn"].ConnectionString %>'
  5. alert(conStr);
  6. var appStr = '<%=ConfigurationManager.AppSettings["serverip"].ToString() %>'
  7. alert(appStr);
  8. }
  9. </script>
Step-2: Now take a button and call the above function on its OnClientClick event.
  1. <asp:Button ID="Button1" runat="server" Text="display webconfig" OnClientClick="ReadConfigFile()" />