How to insert session data and get with key using dictionary?

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MVC4

Could you please help on the below thing.


I want to store the session data into dictionary object with key and get that data in to controller based on that key.

I have found the below code but not able to set the session data into controller.

public static void SetValue(string dictionaryName, string key, string value)
       {
           if (!String.IsNullOrEmpty(key))
           {
               if (HttpContext.Current.Session[dictionaryName] != null)
               {
                   Dictionary<string, string> form = (Dictionary<string, string>)HttpContext.Current.Session[dictionaryName];
                   if (form.ContainsKey(key))
                   {
                       form[key] = value;
                   }
               }
           }
       }

Clear requirement :

First time i will search with account number that data should store into dictionary after that i will search with another account number that also store into same dictionary with different key finally i want to get the particular session based on key with in that dictionary.