winApp C# สอบถามวิธี ค้นหา ตัวแปรที่ประกาศไว้ใน คลาส ครับ

 private Database.DATALAB_Contact dATALAB_Contact;
        private System.Windows.Forms.BindingSource contact_listBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_listTableAdapter contact_listTableAdapter;
        private Database.DATALAB_ContactTableAdapters.TableAdapterManager tableAdapterManager;
        private System.Windows.Forms.TabControl tabControl1;
        private System.Windows.Forms.TabPage tabPage1;
        private System.Windows.Forms.TabPage tabPage2;
        private System.Windows.Forms.BindingNavigator contact_listBindingNavigator;
        private System.Windows.Forms.ToolStripButton bindingNavigatorAddNewItem;
        private System.Windows.Forms.ToolStripLabel bindingNavigatorCountItem;
        private System.Windows.Forms.ToolStripButton bindingNavigatorDeleteItem;
        private System.Windows.Forms.ToolStripButton bindingNavigatorMoveFirstItem;
        private System.Windows.Forms.ToolStripButton bindingNavigatorMovePreviousItem;
        private System.Windows.Forms.ToolStripSeparator bindingNavigatorSeparator;
        private System.Windows.Forms.ToolStripTextBox bindingNavigatorPositionItem;
        private System.Windows.Forms.ToolStripSeparator bindingNavigatorSeparator1;
        private System.Windows.Forms.ToolStripButton bindingNavigatorMoveNextItem;
        private System.Windows.Forms.ToolStripButton bindingNavigatorMoveLastItem;
        private System.Windows.Forms.ToolStripSeparator bindingNavigatorSeparator2;
        private System.Windows.Forms.ToolStripButton contact_listBindingNavigatorSaveItem;
        private System.Windows.Forms.DateTimePicker dateEditDateTimePicker;
        private System.Windows.Forms.TextBox manEditTextBox;
        private System.Windows.Forms.TextBox remarkTextBox;
        private System.Windows.Forms.TextBox webSiteTextBox;
        private System.Windows.Forms.TextBox contact_TextIDTextBox;
        private System.Windows.Forms.TextBox contact_list_Name_2TextBox;
        private System.Windows.Forms.TextBox contact_list_Name_1TextBox;
        private System.Windows.Forms.TextBox contact_list_IDTextBox;
        private System.Windows.Forms.BindingNavigator bindingNavigator1;
        private System.Windows.Forms.ToolStripButton toolStripButton1;
        private System.Windows.Forms.ToolStripLabel toolStripLabel1;
        private System.Windows.Forms.ToolStripButton toolStripButton2;
        private System.Windows.Forms.ToolStripButton toolStripButton3;
        private System.Windows.Forms.ToolStripButton toolStripButton4;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox1;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator2;
        private System.Windows.Forms.ToolStripButton toolStripButton5;
        private System.Windows.Forms.ToolStripButton toolStripButton6;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator3;
        private System.Windows.Forms.ToolStripButton toolStripButton7;
        private System.Windows.Forms.TabPage tabPage3;
        private System.Windows.Forms.BindingNavigator bindingNavigator2;
        private System.Windows.Forms.ToolStripButton toolStripButton8;
        private System.Windows.Forms.ToolStripLabel toolStripLabel2;
        private System.Windows.Forms.ToolStripButton toolStripButton9;
        private System.Windows.Forms.ToolStripButton toolStripButton10;
        private System.Windows.Forms.ToolStripButton toolStripButton11;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator4;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox2;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator5;
        private System.Windows.Forms.ToolStripButton toolStripButton12;
        private System.Windows.Forms.ToolStripButton toolStripButton13;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator6;
        private System.Windows.Forms.ToolStripButton toolStripButton14;
        private System.Windows.Forms.TabPage tabPage4;
        private System.Windows.Forms.BindingNavigator bindingNavigator3;
        private System.Windows.Forms.ToolStripButton toolStripButton15;
        private System.Windows.Forms.ToolStripLabel toolStripLabel3;
        private System.Windows.Forms.ToolStripButton toolStripButton16;
        private System.Windows.Forms.ToolStripButton toolStripButton17;
        private System.Windows.Forms.ToolStripButton toolStripButton18;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator7;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox3;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator8;
        private System.Windows.Forms.ToolStripButton toolStripButton19;
        private System.Windows.Forms.ToolStripButton toolStripButton20;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator9;
        private System.Windows.Forms.ToolStripButton toolStripButton21;
        private System.Windows.Forms.TabPage tabPage5;
        private System.Windows.Forms.BindingNavigator bindingNavigator4;
        private System.Windows.Forms.ToolStripButton toolStripButton22;
        private System.Windows.Forms.ToolStripLabel toolStripLabel4;
        private System.Windows.Forms.ToolStripButton toolStripButton23;
        private System.Windows.Forms.ToolStripButton toolStripButton24;
        private System.Windows.Forms.ToolStripButton toolStripButton25;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator10;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox4;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator11;
        private System.Windows.Forms.ToolStripButton toolStripButton26;
        private System.Windows.Forms.ToolStripButton toolStripButton27;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator12;
        private System.Windows.Forms.ToolStripButton toolStripButton28;
        private System.Windows.Forms.TabPage tabPage6;
        private System.Windows.Forms.BindingNavigator bindingNavigator5;
        private System.Windows.Forms.ToolStripButton toolStripButton29;
        private System.Windows.Forms.ToolStripLabel toolStripLabel5;
        private System.Windows.Forms.ToolStripButton toolStripButton30;
        private System.Windows.Forms.ToolStripButton toolStripButton31;
        private System.Windows.Forms.ToolStripButton toolStripButton32;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator13;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox5;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator14;
        private System.Windows.Forms.ToolStripButton toolStripButton33;
        private System.Windows.Forms.ToolStripButton toolStripButton34;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator15;
        private System.Windows.Forms.ToolStripButton toolStripButton35;
        private System.Windows.Forms.TabPage tabPage7;
        private System.Windows.Forms.BindingNavigator bindingNavigator6;
        private System.Windows.Forms.ToolStripButton toolStripButton36;
        private System.Windows.Forms.ToolStripLabel toolStripLabel6;
        private System.Windows.Forms.ToolStripButton toolStripButton37;
        private System.Windows.Forms.ToolStripButton toolStripButton38;
        private System.Windows.Forms.ToolStripButton toolStripButton39;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator16;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox6;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator17;
        private System.Windows.Forms.ToolStripButton toolStripButton40;
        private System.Windows.Forms.ToolStripButton toolStripButton41;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator18;
        private System.Windows.Forms.ToolStripButton toolStripButton42;
        private System.Windows.Forms.TabPage tabPage8;
        private System.Windows.Forms.BindingNavigator bindingNavigator7;
        private System.Windows.Forms.ToolStripButton toolStripButton43;
        private System.Windows.Forms.ToolStripLabel toolStripLabel7;
        private System.Windows.Forms.ToolStripButton toolStripButton44;
        private System.Windows.Forms.ToolStripButton toolStripButton45;
        private System.Windows.Forms.ToolStripButton toolStripButton46;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator19;
        private System.Windows.Forms.ToolStripTextBox toolStripTextBox7;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator20;
        private System.Windows.Forms.ToolStripButton toolStripButton47;
        private System.Windows.Forms.ToolStripButton toolStripButton48;
        private System.Windows.Forms.ToolStripSeparator toolStripSeparator21;
        private System.Windows.Forms.ToolStripButton toolStripButton49;
        private System.Windows.Forms.BindingSource contactAddressBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_AddressTableAdapter contact_AddressTableAdapter;
        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.DataGridView contact_listDataGridView;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn1;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn2;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn3;
        private System.Windows.Forms.BindingSource contact_ContacttypeBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_ContacttypeTableAdapter contact_ContacttypeTableAdapter;
        private System.Windows.Forms.DataGridView contact_ContacttypeDataGridView;
        private System.Windows.Forms.BindingSource contact_BankBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_BankTableAdapter contact_BankTableAdapter;
        private System.Windows.Forms.DataGridView contact_BankDataGridView;
        private System.Windows.Forms.BindingSource contact_Contact_BilltpeBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_Contact_BilltpeTableAdapter contact_Contact_BilltpeTableAdapter;
        private System.Windows.Forms.DataGridView contact_Contact_BilltpeDataGridView;
        private Database.DS_Company_Setting dS_Company_Setting;
        private System.Windows.Forms.BindingSource contactBillTypeBindingSource;
        private Database.DS_Company_SettingTableAdapters.Contact_BillTypeTableAdapter contact_BillTypeTableAdapter;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn18;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn19;
        private System.Windows.Forms.DataGridViewComboBoxColumn dataGridViewTextBoxColumn20;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn21;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn22;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn23;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn24;
        private System.Windows.Forms.BindingSource bankBindingSource;
        private Database.DS_Company_SettingTableAdapters.BankTableAdapter bankTableAdapter;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn10;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn11;
        private System.Windows.Forms.DataGridViewComboBoxColumn dataGridViewTextBoxColumn12;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn13;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn14;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn15;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn16;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn17;
        private System.Windows.Forms.BindingSource contactBusinesstypeBindingSource;
        private Database.DS_Company_SettingTableAdapters.Contact_BusinesstypeTableAdapter contact_BusinesstypeTableAdapter;
        private System.Windows.Forms.BindingSource contactTypeBindingSource;
        private Database.DS_Company_SettingTableAdapters.Contact_TypeTableAdapter contact_TypeTableAdapter;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn4;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn5;
        private System.Windows.Forms.DataGridViewComboBoxColumn dataGridViewTextBoxColumn6;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn7;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn8;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn9;
        private System.Windows.Forms.TabControl tabControl2;
        private System.Windows.Forms.TabPage tabPage9;
        private System.Windows.Forms.TabPage tabPage10;
        private System.Windows.Forms.DataGridView contact_AddressDataGridView;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn25;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn26;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn27;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn28;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn29;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn30;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn31;
        private System.Windows.Forms.DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn1;
        private System.Windows.Forms.DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn2;
        private System.Windows.Forms.DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn3;
        private System.Windows.Forms.DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn4;
        private System.Windows.Forms.DataGridViewCheckBoxColumn dataGridViewCheckBoxColumn5;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn32;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn33;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn34;
        private System.Windows.Forms.BindingSource contact_ContactnameBindingSource;
        private Database.DATALAB_ContactTableAdapters.Contact_ContactnameTableAdapter contact_ContactnameTableAdapter;
        private System.Windows.Forms.DataGridView contact_ContactnameDataGridView;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn35;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn36;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn37;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn38;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn39;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn40;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn41;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn42;
        private System.Windows.Forms.DataGridViewTextBoxColumn dataGridViewTextBoxColumn43;