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The Items property is read only as its purpose is to return a reference to the collection.
You can however add objects to the collection using its Add method.
It can be difficult to separate the details that apply to the Data Grid generally and the technology it is being used with specifically.
This article will show you exactly where they are and how the Data Grid works.
The standard answer is to use data binding and unless you understand how all this works it great detail it can obscure the simplicity of the mechanism.