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using (FbDataReader reader = command.ExecuteReader(CommandBehavior.Default))
{
    while (reader.Read())
    {
        row = table.NewRow();
        for (int i = 0;i < reader.FieldCount;i++)
        {
            if (reader.GetValue(i) is DateTime)
                row[i.ToString()] = reader.GetDateTime(i);
            else if (reader.GetValue(i) is double)
                row[i.ToString()] = reader.GetDouble(i);
            else
                row[i.ToString()] = reader.GetValue(i);
    }
}					

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FbCommand command = connection.CreateCommand();
command.CommandType = CommandType.StoredProcedure;
command.CommandText = procedureName;
//Parameter hinzufügen, falls vorhanden
if (parameters != null)
    for (int i=0; i<parameters.GetLength(0); i++)
        command.Parameters.AddWithValue(parameters[i,0],parameters[i,1]);					

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FbDataAdapter adapter = new FbDataAdapter(command);
adapter.Fill(table);