[ArgumentException: an item with the same key has already been added]
System.throwHelper.throwArgumentException(ExceptionResource resource) +51
System.Collections.Generic.Dictionary'2.Insert(Tkey Key,Tvalue value,Boolean add) +7462172
System.Web.Query.Dynamic.ClassFactory.GetDynamicClass(IEnumerable '1 properties) +122
System.Web.Query.Dynamic.ExpressionParser.ParseNew() +406
System.Web.Query.Dynamic.ExpressionParser.ParseIdentifier() +230
System.Web.Query.Dynamic.ExpressionParser.ParsePrimaryStart() +34
System.Web.Query.Dynamic.ExpressionParser.ParsePrimary() +13
System.Web.Query.Dynamic.ExpressionParser.ParseUnary() +259

Above written lines are the errors coming in my project. These errors are coming very rearly.

If anyone have the solution i shall be very thankful.
Please reply.

You're using a dictionary and you're trying to add an item with same key. Check code, avoid that.

Dictionary.add("key1","item1")
Dictionary.add("key2","item2")
Dictionary.add("key1","item3") << not allowed.

Check what part of your code is causing that.

---

Thanks

- Omie
Someone makes my heart skip a clock cycle !

Hi Dheer_brain,

From my experience, the root cause is that you add an item whose key is already contained in the dictionary.

If you want to allow the later item override the former item, please follow this:
"key"] = "value";Otherwise, please follow this:(dic.ContainsKey("key") == false) dic.Add("key", "value");

Let me know if this helps.
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.

You're using a dictionary and you're trying to add an item with same key. Check code, avoid that.

Dictionary.add("key1","item1")
Dictionary.add("key2","item2")
Dictionary.add("key1","item3") << not allowed.

Check what part of your code is causing that.

---

Thanks

- Omie
Someone makes my heart skip a clock cycle !

Hi Dheer_brain,

From my experience, the root cause is that you add an item whose key is already contained in the dictionary.

If you want to allow the later item override the former item, please follow this:
"key"] = "value";Otherwise, please follow this:(dic.ContainsKey("key") == false) dic.Add("key", "value");

Let me know if this helps.
Aland Li

---

Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.