SqlDataReader.GetTextReader Method (Int32)
Retrieves Char, NChar, NText, NVarChar, text, varChar, and Variant data types as a TextReader.
Assembly: System.Data (in System.Data.dll)
The connection drops or is closed during the data retrieval.
The SqlDataReader is closed during the data retrieval.
There is no data ready to be read (for example, the first Read hasn't been called, or returned false).
Tried to read a previously-read column in sequential mode.
There was an asynchronous operation in progress. This applies to all Get* methods when running in sequential mode, as they could be called while reading a stream.
Trying to read a column that does not exist.
The returned type was not one of the types below:
Null values will be returned as an empty (zero bytes) TextReader.
For more information, see SqlClient Streaming Support.
Available since 4.5