JS call C # backend function to get background parameters (HTML get C # parameter)

C # has its own background control, which is simple and convenient to interact with the background, but sometimes it has to use HTML controls and how to interact with the background is a problem. For example, HTML gets background parameters and uploads to PHP for database operations. The following is a brief introduction to the JS call back function to get to the foreground parameters

C # background code (Default.aspx.cs):

1   Public string getparameter () 2     {3         string" This is the parameter to be passed to the foreground "; 4         return parameter; 5     }

Default.aspx part of the code:

Note that this part of the code is written in the ASPX page and cannot be placed in a separate JS file because the ' <%=getparameter ()%> ' method needs to be recognized in ASPX.

    <script type="text/javascript"        Function Change () {                 
                   var'<%=getparameter ()%>';                  alert (f);          }          window.onload = Change ;      </script>

Operation Result: