There is already an open DataReader associated with this Command which must be closed first.

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There is already an open DataReader associated with this Command which must be closed first.

how to slove this like of error

Posted 28-Aug-14 0:05am

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Herman<T>.Instance 28-Aug-14 6:20am

the exception tells it all.
You don't show code so we cannot help you where the error occurs. Please Improve your question and add the code that gets into error.

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Raul Iloc · Answer 1 · 2014-08-28T00:18:00

1.Cannot exist more then an open reader for a given command, so you must close the reader after its usage.

2.You should use DataReader by using try-finally block like in the next example:

C#

List<ErpCountry> resultList = new List<ErpCountry>();
DataReader reader = null;
//
try
{
    IDbCommand dbCommand = new SqlCommand();
    dbCommand.Connection = _session.DbConnection;
    dbCommand.CommandText = string.Format("SELECT ID, Name from Countries");
    //
    if (_session.DbConnection.State == ConnectionState.Closed)
        _session.DbConnection.Open();
    //
    reader = dbCommand.ExecuteReader();
    //
    while (reader.Read())
    {
        ErpCountry erpEntity = new ErpCountry();
        erpEntity.ID = (int)reader["ID"];
        erpEntity.Name = (string)reader["Name"];
        //
        resultList.Add(erpEntity);
    }
}
finally
{
    if (reader != null)
        reader.Close();
    //
    _session.DbConnection.Close();
}

vangapally Naveen Kumar · Answer 2 · 2014-08-28T00:24:00

Solution 2

the exception tells it all.

datareader use like this.

C#

if (dr.HasRows)
{
while (dr.Read())
{
\\your code
}
}
dr.close();

Posted 28-Aug-14 0:24am

vangapally Naveen Kumar

Pravuprasad · Answer 3 · 2014-08-28T00:54:00

Solution 3

close the datareader by using close() . And in your case the exception tells all. Else please show your code here.

Posted 28-Aug-14 0:54am

Pravuprasad