C# Dictionary push and pull

gistfile1.cs

public static class Extensions
{
    public static bool Push<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key, TValue value)
    {
        try
        {
            if (dictionary.ContainsKey(key))
            {
                dictionary[key] = value;
            }
            else
            {
                dictionary.Add(key, value);
            }
            return true;
        }
        catch (Exception ex)
        {
            return false;
        }
    }
    public static TValue Pull<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, TKey key)
    {
        try
        {
            return dictionary.ContainsKey(key) ? dictionary[key] : default(TValue);
        }
        catch (Exception ex)
        {
            return default(TValue);
        }
    }
}

thanks