System.NullReferenceException: Object reference not set to an instance of an object. at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId) at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force) at MySql.Data.MySqlClient.MySqlDataReader.NextResult() at MySql.Data.MySqlClient.MySqlDataReader.Close() at MySql.Data.MySqlClient.MySqlDataReader.Dispose() at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery() at MySql.Data.MySqlClient.Driver.Configure(MySqlConnection connection) at MySql.Data.MySqlClient.MySqlConnection.Open() at MetalDesignGallery.Connection.Connect() at MetalDesignGallery._Default.GetAllCategory()