/// <summary>
/// Retrieves the value of the designated column in the current row of this <see cref="ResultSet"/> object as a <see cref="System.String"/>.
/// </summary>
/// <param name="columnName">column name</param>
/// <returns>result of string type</returns>
public string GetString(string columnName)
{
return(_resultSet.GetString(columnName));
}