I found the solutionhere.MVC Routing is not available by default in Sitecore 7.0 and we have to create one.

Create a custom processor for the initialize pipeline and define custom route in the Process method similar to the following:

public class RegisterCustomRoute{   public virtual void Process(PipelineArgs args)   {     RouteTable.Routes.MapRoute("CustomRoute", "mycustomroute/{controller}/{action}/{id}");   }}

Add this processor to the initialize pipeline right before the Sitecore InitializeRoutes processor. You can do this with the help of the configuration patch file in the following way:

<?xml version="1.0" encoding="utf-8"?><configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">     <sitecore>          <pipelines>               <initialize>                    <processor type="MyNamespace.RegisterCustomRoute, MyAssembly" patch:before="processor[@type='Sitecore.Mvc.Pipelines.Loader.InitializeRoutes, Sitecore.Mvc']" />               </initialize>          </pipelines>     </sitecore></configuration>

Important: Ensure your custom configuration patch file is applied as the last patch to Sitecore configuration.
You can do this by placing the patch file into a subfolder of the/App_Config/Include directory. The name of the subfolder must be the last one alphabetically related to other subfolders (such as Z_CustomConfigs).

And the JS code will be like:

$.ajax({       url: '/mycustomroute/<controllername>/<actionname>',       type: "POST",       data: '{sampleModel: ' + JSON.stringify(jsModel) + '}',       contentType: "application/json; charset=utf-8",       dataType: "json",       success: function (response) {       },  });

• ajax