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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlcommand.endexecutereader below:

SqlCommand.EndExecuteReader(IAsyncResult) Method (System.Data.SqlClient) | Microsoft Learn

SqlCommand.EndExecuteReader(IAsyncResult) Method Definition

Finishes asynchronous execution of a Transact-SQL statement, returning the requested SqlDataReader.

public:
 System::Data::SqlClient::SqlDataReader ^ EndExecuteReader(IAsyncResult ^ asyncResult);

public System.Data.SqlClient.SqlDataReader EndExecuteReader(IAsyncResult asyncResult);

member this.EndExecuteReader : IAsyncResult -> System.Data.SqlClient.SqlDataReader

Public Function EndExecuteReader (asyncResult As IAsyncResult) As SqlDataReader

Parameters Returns

A SqlDataReader object that can be used to retrieve the requested rows.

Exceptions

asyncResult parameter is null (Nothing in Microsoft Visual Basic)

Examples

For examples demonstrating the use of the EndExecuteReader method, see BeginExecuteReader.

Remarks

When you call BeginExecuteReader to execute a Transact-SQL statement, you must call EndExecuteReader in order to complete the operation. If the process of executing the command has not yet finished, this method blocks until the operation is complete. Users can verify that the command has completed its operation by using the IAsyncResult instance returned by the BeginExecuteReader method. If a callback procedure was specified in the call to BeginExecuteReader, this method must be called.