using System;

using System.Web;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var myDict = new Dictionary<int, string>()

{

    { 1, "foo" },

    { 2, "bar" }

};

        var result = myDict.GetValue(5, "baz");

        Console.WriteLine(result);

    }

}

​

public static class DictionaryExtensions

{

    public static TValue GetValue<TKey, TValue>(this IDictionary<TKey, TValue> source, TKey key, TValue defaultValue)

    {

        return (source.ContainsKey(key) ? source[key] : defaultValue);

    }

}

​

public static class WebExtensions

{

    public static T GetValue<T>(this HttpContext context, string name, T defaultValue)

    {

        object value = context.Request.Form[name] ?? context.Request.QueryString[name];

        if (value == null) return defaultValue;

        return (T)value;

    }

}