linq - include keyword not providing filter with extension method -

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I want to use the keyword with some selection like this: 

  context Categories (C => c.products)   
 I searched the Internet and found the following method:  
  Public static class ObjectQueryExtension {public Fixed ObjectQuery & lt; T & gt; Include & lt; T & gt; (This objectivity should include & lt; T & gt; Mainclline, Expression & lt; Func & lt; T, Object & gt; & gt; subselector) {mainQuery Include (Subscriber Options as Sub-Selector.) System. Reflection.PropertyInfo) .name); }}   
 When I pasted this project in my project and when I was typing  
  context.category.include () //   
 So it's just looking like the parameter to use the string:  
  context.category.include (""); // like this   
 I want to use keywords like this:  
  context.Categories.Include (c => c.products )   
 Can any organization tell me about this problem ???   
 
 
 You have to enter the property in this extension as a string Method:  
 < Code> context.category.include ("Products");   
 Include dafault  ()  of  System.Data.Entity  also takes the string path:  
  Public goods & lt; T & gt; Include (String Path)   
 You can refer to

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