DataGridView BindingSource BindNavigator

private void button1_Click(object sender, EventArgs e)
        {
            bindingNavigator1.BindingSource = bindingSource1;
            LoadData();
        }

        private void LoadData()
        {
            // The xml to bind to.
            string xml = @"<US><states>"
                + @"<state><name>Washington</name><capital>Olympia</capital></state>"
                + @"<state><name>Oregon</name><capital>Salem</capital></state>"
                + @"<state><name>California</name><capital>Sacramento</capital></state>"
                + @"<state><name>Nevada</name><capital>Carson City</capital></state>"
                + @"</states></US>";

            // Convert the xml string to bytes and load into a memory stream.
            byte[] xmlBytes = Encoding.UTF8.GetBytes(xml);
            MemoryStream stream = new MemoryStream(xmlBytes, false);

            // Create a DataSet and load the xml into it.
            DataSet set = new DataSet();
            set.ReadXml(stream);

            // Set the DataSource to the DataSet, and the DataMember
            // to state.
            bindingSource1.DataSource = set;
            bindingSource1.DataMember = "state";

            
            textBox1.DataBindings.Add("Text", bindingSource1, "name");
            textBox2.DataBindings.Add("Text", bindingSource1, "capital");

        }


//------------------------------------------------------


//DataGridView BindingSource绑定更新示例.txt.cs
//根据selectCommand生成增、删、改 命令 SqlCommandBuilder

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private DataGridView dataGridView1 = new DataGridView();
    private BindingSource bindingSource1 = new BindingSource();
    private SqlDataAdapter dataAdapter = new SqlDataAdapter();
    private Button reloadButton = new Button();
    private Button submitButton = new Button();

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new Form1());
    }

    // Initialize the form.
    public Form1()
    {
        dataGridView1.Dock = DockStyle.Fill;

        reloadButton.Text = "reload";
        submitButton.Text = "submit";
        reloadButton.Click += new System.EventHandler(reloadButton_Click);
        submitButton.Click += new System.EventHandler(submitButton_Click);

        FlowLayoutPanel panel = new FlowLayoutPanel();
        panel.Dock = DockStyle.Top;
        panel.AutoSize = true;
        panel.Controls.AddRange(new Control[] { reloadButton, submitButton });

        this.Controls.AddRange(new Control[] { dataGridView1, panel });
        this.Load += new System.EventHandler(Form1_Load);
        this.Text = "DataGridView databinding and updating demo";
        
        //处理数据异常事件
        this.dataGridView1.DataError += new DataGridViewDataErrorEventHandler(dataGridView1_DataError);
        
    }

    void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
    {
        MessageBox.Show(e.Exception.Message);
        e.Cancel = true;
    }

    private void Form1_Load(object sender, System.EventArgs e)
    {
        // Bind the DataGridView to the BindingSource
        // and load the data from the database.
        dataGridView1.DataSource = bindingSource1;
        GetData("select * from tuser");
    }

    private void reloadButton_Click(object sender, System.EventArgs e)
    {
        // Reload the data from the database.
        GetData(dataAdapter.SelectCommand.CommandText);
    }

    private void submitButton_Click(object sender, System.EventArgs e)
    {
        // Update the database with the user's changes.
        dataAdapter.Update((DataTable)bindingSource1.DataSource);
    }

    private void GetData(string selectCommand)
    {
        try
        {
            // Specify a connection string. Replace the given value with a 
            // valid connection string for a Northwind SQL Server sample
            // database accessible to your system.
            String connectionString =
                "Integrated Security=SSPI;Persist Security Info=False;" +
                @"Initial Catalog=Migrate;Data Source=.\SQLSERVER2005";

            // Create a new data adapter based on the specified query.
            dataAdapter = new SqlDataAdapter(selectCommand, connectionString);

            // Create a command builder to generate SQL update, insert, and
            // delete commands based on selectCommand. These are used to
            // update the database.
            //根据selectCommand生成增、删、改 命令
            SqlCommandBuilder commandBuilder = new SqlCommandBuilder(dataAdapter);

            // Populate a new data table and bind it to the BindingSource.
            DataTable table = new DataTable();
            table.Locale = System.Globalization.CultureInfo.InvariantCulture;
            dataAdapter.Fill(table);
            bindingSource1.DataSource = table;

            // Resize the DataGridView columns to fit the newly loaded content.
            dataGridView1.AutoResizeColumns(
                DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader);
            //隐藏ID列
            this.dataGridView1.Columns[0].Visible = false;
        }
        catch (SqlException)
        {
            MessageBox.Show("To run this example, replace the value of the " +
                "connectionString variable with a connection string that is " +
                "valid for your system.");
        }
    }

}

//------------------------------------------------------------------

//dataGridView1_CellFormatting
// if (Int32.TryParse((String)e.Value, out intValue) &&
//                    (intValue < 0))
//经典转换

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ns2
{
    public class Form1 : Form
    {
        private DataGridView dataGridView1 = new DataGridView();
        private Bitmap highPriImage;
        private Bitmap mediumPriImage;
        private Bitmap lowPriImage;

        public Form1()
        {
            // Initialize the images. 
            try
            {
                highPriImage = new Bitmap("red.bmp");
                mediumPriImage = new Bitmap("green.bmp");
                lowPriImage = new Bitmap("brown.bmp");
            }
            catch (ArgumentException)
            {
                MessageBox.Show("The Priority column requires Bitmap images " +
                    "named highPri.bmp, mediumPri.bmp, and lowPri.bmp " +
                    "residing in the same directory as the executable file.");
            }

            // Initialize the DataGridView.
            dataGridView1.Dock = DockStyle.Fill;
            dataGridView1.AllowUserToAddRows = false;
            dataGridView1.Columns.AddRange(
                new DataGridViewTextBoxColumn(),
                new DataGridViewImageColumn());
            dataGridView1.Columns[0].Name = "Balance";
            dataGridView1.Columns[1].Name = "Priority";
            dataGridView1.Rows.Add("-100", "high");
            dataGridView1.Rows.Add("0", "medium");
            dataGridView1.Rows.Add("100", "low");
            dataGridView1.CellFormatting +=
                new System.Windows.Forms.DataGridViewCellFormattingEventHandler(
                this.dataGridView1_CellFormatting);
            this.Controls.Add(dataGridView1);
        }

        // Changes how cells are displayed depending on their columns and values.
        private void dataGridView1_CellFormatting(object sender,
            System.Windows.Forms.DataGridViewCellFormattingEventArgs e)
        {
            // Set the background to red for negative values in the Balance column.
            if (dataGridView1.Columns[e.ColumnIndex].Name.Equals("Balance"))
            {
                Int32 intValue;
                if (Int32.TryParse((String)e.Value, out intValue) &&
                    (intValue < 0))
                {
                    e.CellStyle.BackColor = Color.Red;
                    e.CellStyle.SelectionBackColor = Color.DarkRed;
                }
            }

            // Replace string values in the Priority column with images.
            if (dataGridView1.Columns[e.ColumnIndex].Name.Equals("Priority"))
            {
                // Ensure that the value is a string.
                String stringValue = e.Value as string;
                if (stringValue == null) return;

                // Set the cell ToolTip to the text value.
                DataGridViewCell cell = dataGridView1[e.ColumnIndex, e.RowIndex];
                cell.ToolTipText = stringValue;

                // Replace the string value with the image value.
                switch (stringValue)
                {
                    case "high":
                        e.Value = highPriImage;
                        break;
                    case "medium":
                        e.Value = mediumPriImage;
                        break;
                    case "low":
                        e.Value = lowPriImage;
                        break;
                }
            }
        }

        public static void Main()
        {
            Application.Run(new Form1());
        }

    }
}