How can you get the ColumnName,DataType ColumnSize, IsKeyColumn,IsAutoIncrement of the table from the dataset?

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Question:
How can you get the ColumnName,DataType ColumnSize,
IsKeyColumn,IsAutoIncrement of the table from the dataset?

1.GetSchemaTable method of the DataReader

2.Fill method of data adaptor

3.GetTableDetails method

4.Dataset.GetDataTable()

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