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When is an item with the same key has already been added?
An item with the same key has already been added. [ArgumentException: An item with the same key has already been added.] Most likely, you have model which contains the same property twice. Perhaps you are using new to hide the base property. Solution is to override the property or use another name.
What happens when you enter the wrong product key?
You’ll see this message along with either error code INVALID_PRODUCT_KEY or error code ERR_INVALID_TOKEN if you enter the wrong product key, or if you have a typo in your product key. Most Microsoft products use a 25-character product key.
How to find item with same key in ASP.NET?
I downloaded the source code from http://referencesource.microsoft.com/DotNetReferenceSource.zip and setup VS to debug framework source. Opened up Dictionary.cs in VS ran the project, once page loads, added a debug at the line ThrowHelper.ThrowArgumentException (ExceptionResource.Argument_AddingDuplicate); and was able to see the ‘key’ value.
What to do if your Microsoft Product Key has already been used?
This product key has already been used Your product key can only be redeemed once. It isn’t meant to be re-used or shared. If you get a message that your product key has already been used, you can go directly to your Microsoft account, Services & subscriptions page to install your product and manage your subscription benefits.
How can I resolve ” item has already been added “?
When I checked the trace file I got this entry: I don’t know how to solve this issue. The problem is that in a sorted list each key needs to be unique. So you need to check that you aren’t inserting the same key (guid value) twice. Code shown below: This will ensure that each key is unique.
Why is my dictionary adding the same key twice?
The exception indicates that you adding same key twice to your dictionary, to solve this issue you can start by insuring that the DataModelCollection objects which passed to the function has unique Key values (which in your case is a Guid data type) dmo.Guid Thanks for contributing an answer to Stack Overflow!