Different ways of adding to Dictionary

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What is the difference in Dictionary.add(key, value) and Dictionary[key] = value?

I've noticed that the last version does not throw an ArgumentException when inserting a duplicate key, but is there any reason to prefer the first version?

Edit: Does anyone have an authoritative source of information about this? I've tried MSDN, but it is as always a wild goose chase :(

optimization dictionary c#
8 Answers

To insert the Value into the Dictionary

 Dictionary<string, string> dDS1 = new Dictionary<string, string>();//Declaration
 dDS1.Add("VEqpt", "aaaa");//adding key and value into the dictionary
 string Count = dDS1["VEqpt"];//assigning the value of dictionary key to Count variable
 dDS1["VEqpt"] = Count + "bbbb";//assigning the value to key
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