C++: read SQL server data using System::Data::SqlClient

stdafx.h:

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
#pragma once
#using <mscorlib.dll>
#using <System.dll>
#using <System.Data.dll>
#using <System.Xml.dll>
// TODO: reference additional headers your program requires here

　　Form1.h

#pragma once

namespace SQLServer2008R2inCCLI {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace System::Configuration;
    using namespace ADODB;//c:\Program Files\Common Files\System\ADO\msado15.dll

	using namespace System::Data::SqlClient;

	/// <summary>
	/// Summary for Form1
	///
	/// WARNING: If you change the name of this class, you will need to change the
	///          'Resource File Name' property for the managed resource compiler tool
	///          associated with all .resx files this class depends on.  Otherwise,
	///          the designers will not be able to interact properly with localized
	///          resources associated with this form.
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	        private: System::Windows::Forms::DataGridView^ dataGridView1;
        private: System::Windows::Forms::Label^ label1;
        private: System::Windows::Forms::ComboBox^ comboBoxTables;
        private: System::Windows::Forms::Button^ buttonOK;
        private: System::Windows::Forms::ToolTip^ toolTip1;
	private: System::ComponentModel::IContainer^  components;
	protected: 

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			this->components = (gcnew System::ComponentModel::Container());
			this->dataGridView1 = (gcnew System::Windows::Forms::DataGridView());
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->comboBoxTables = (gcnew System::Windows::Forms::ComboBox());
			this->buttonOK = (gcnew System::Windows::Forms::Button());
			this->toolTip1 = (gcnew System::Windows::Forms::ToolTip(this->components));
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->dataGridView1))->BeginInit();
			this->SuspendLayout();
			//
			// dataGridView1
			//
			this->dataGridView1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>((((System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom)
				| System::Windows::Forms::AnchorStyles::Left)
				| System::Windows::Forms::AnchorStyles::Right));
			this->dataGridView1->ColumnHeadersHeightSizeMode = System::Windows::Forms::DataGridViewColumnHeadersHeightSizeMode::AutoSize;
			this->dataGridView1->Location = System::Drawing::Point(12, 44);
			this->dataGridView1->Name = L"dataGridView1";
			this->dataGridView1->ShowCellToolTips = false;
			this->dataGridView1->Size = System::Drawing::Size(493, 266);
			this->dataGridView1->TabIndex = 0;
			this->dataGridView1->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, &Form1::dataGridView1_MouseDown);
			this->dataGridView1->DataError += gcnew System::Windows::Forms::DataGridViewDataErrorEventHandler(this, &Form1::dataGridView1_DataError);
			//
			// label1
			//
			this->label1->Location = System::Drawing::Point(12, 9);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(65, 32);
			this->label1->TabIndex = 1;
			this->label1->Text = L"Select table to show:";
			//
			// comboBoxTables
			//
			this->comboBoxTables->DropDownStyle = System::Windows::Forms::ComboBoxStyle::DropDownList;
			this->comboBoxTables->FormattingEnabled = true;
			this->comboBoxTables->Location = System::Drawing::Point(83, 12);
			this->comboBoxTables->Name = L"comboBoxTables";
			this->comboBoxTables->Size = System::Drawing::Size(165, 21);
			this->comboBoxTables->TabIndex = 2;
			//
			// buttonOK
			//
			this->buttonOK->Location = System::Drawing::Point(254, 12);
			this->buttonOK->Name = L"buttonOK";
			this->buttonOK->Size = System::Drawing::Size(56, 21);
			this->buttonOK->TabIndex = 3;
			this->buttonOK->Text = L"OK";
			this->buttonOK->UseVisualStyleBackColor = true;
			this->buttonOK->Click += gcnew System::EventHandler(this, &Form1::buttonOK_Click);
			//
			// toolTip1
			//
			this->toolTip1->AutoPopDelay = 5000;
			this->toolTip1->InitialDelay = 0;
			this->toolTip1->IsBalloon = true;
			this->toolTip1->ReshowDelay = 0;
			this->toolTip1->ToolTipIcon = System::Windows::Forms::ToolTipIcon::Warning;
			this->toolTip1->UseAnimation = false;
			this->toolTip1->UseFading = false;
			//
			// Form1
			//
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(517, 322);
			this->Controls->Add(this->buttonOK);
			this->Controls->Add(this->comboBoxTables);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->dataGridView1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
			this->FormClosed += gcnew System::Windows::Forms::FormClosedEventHandler(this, &Form1::Form1_FormClosed);
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->dataGridView1))->EndInit();
			this->ResumeLayout(false);

		}
#pragma endregion
		String ^ServerName, ^DBName;

        SqlConnection ^conn;
        SqlDataAdapter ^adapter;
        DataTable ^dtMain;

	private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {
				 ServerName = "GEOVINDU-PC\\GEOVIN";
            	 DBName = "DuVehicle";

            	 // create database if not exists
            	 //try {
					// ADODB::Connection="";//c:\Program Files\Common Files\System\ADO\msado15.dll

					             	 // connect to server
            	 // to database "master" to check if our database exists
            	 // to create it if it isn't exists
            	 //conn = gcnew SqlConnection("Server=" + ServerName + ";Database=DuVehicle;UID=sa;PWD=geovindu;");
            	 //conn->Open();
					 //SqlCommand ^cmd = gcnew SqlCommand(String::Format("CREATE DATABASE [{0}] ON (" +
      //                                              "    NAME = {0}, " +
						//							"    FILENAME = '" + Application::StartupPath + "\\{0}.mdf'" +
      //                                              ");",
      //                                              DBName), conn);
      //               cmd->ExecuteNonQuery();
					 //delete cmd;
            	/* }
            	 catch (Exception ^ex) { }*/

            	 // create table "Table 1" if not exists
				 //SqlCommand ^cmd = gcnew SqlCommand(String::Format(
     //                                 "IF NOT EXISTS (" +
     //                                 "    SELECT [name] " +
     //                                 "    FROM sys.tables " +
     //                                 "    WHERE [name] = '{0}'" +
     //                                 ") " +
     //                                 "CREATE TABLE [{0}] (" +
     //                                 "    id [INT] IDENTITY(1,1) PRIMARY KEY CLUSTERED, " +
     //                                 "    [text column] [TEXT] NULL, " +
     //                                 "    [int column] [INT] NULL " +
     //                                 ")",
     //                                 "Table 1"), conn);
     //       	 cmd->ExecuteNonQuery();
				 //delete cmd;
            	 conn = gcnew SqlConnection("Server=" + ServerName + ";Database=DuVehicle;UID=sa;PWD=geovindu;");
            	 conn->Open();
            	 // get all tables from DB
            	 DataTable ^dt = conn->GetSchema("Tables");
            	 for (int i = 0; i < dt->Rows->Count; i++) {
					if (dt->Rows[i]->ItemArray[dt->Columns->IndexOf("TABLE_TYPE")]->ToString() == "BASE TABLE") {
						comboBoxTables->Items->Add(dt->Rows[i]->ItemArray[dt->Columns->IndexOf("TABLE_NAME")]->ToString());
					}
                 }
				 delete dt;
			 }
private: System::Void buttonOK_Click(System::Object^  sender, System::EventArgs^  e) {
			 if (comboBoxTables->SelectedItem == nullptr) return;

             adapter = gcnew SqlDataAdapter("SELECT * FROM [" + comboBoxTables->SelectedItem->ToString() + "]", conn);

             gcnew SqlCommandBuilder(adapter);

             dtMain = gcnew DataTable();
             adapter->Fill(dtMain);
             dtMain->Columns["id"]->ReadOnly = true; // deprecate id field edit to prevent exceptions
             dataGridView1->DataSource = dtMain;
		 }
private: System::Void Form1_FormClosed(System::Object^  sender, System::Windows::Forms::FormClosedEventArgs^  e) {
			 if (adapter == nullptr) return;

             adapter->Update(dtMain);
		 }
		 // show tooltip (not intrusive MessageBox) when user trying to input letters into INT column cell
private: System::Void dataGridView1_DataError(System::Object^  sender, System::Windows::Forms::DataGridViewDataErrorEventArgs^  e) {
			 if (dtMain->Columns[e->ColumnIndex]->DataType == Int64::typeid ||
				 dtMain->Columns[e->ColumnIndex]->DataType == Int32::typeid ||
				dtMain->Columns[e->ColumnIndex]->DataType == Int16::typeid)
            {
                Rectangle ^rectColumn;
                rectColumn = dataGridView1->GetColumnDisplayRectangle(e->ColumnIndex, false);

                Rectangle ^rectRow;
                rectRow = dataGridView1->GetRowDisplayRectangle(e->RowIndex, false);

                toolTip1->ToolTipTitle = "This field is for numbers only.";
                toolTip1->Show(" ",
                          dataGridView1,
                          rectColumn->Left, rectRow->Top + rectRow->Height);

				delete rectColumn;
				delete rectRow;
            }
		 }
private: System::Void dataGridView1_MouseDown(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e) {
			 toolTip1->Hide(dataGridView1);
		 }
};
}