System.Data Namespace

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Specifies how to handle existing schema mappings when performing a FillSchema operation.

Member Name	Description
Mapped	Apply any existing table mappings to the incoming schema. Configure the DataSet with the transformed schema.
Source	Ignore any table mappings on the DataAdapter. Configure the DataSet using the incoming schema without applying any transformations.

The SchemaType usually should be set to Mapped, because any established table and column mappings are used.