将excel表格导入到DataGridView

using System.Data.OleDb;

添加一个button控件，一个textBox控件，用于显示选择路径 

private void loadxls()
        {           

            String  fileName = textBox1.Text;
            String connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:/Members.xls;Extended Properties='Excel 8.0;HDR=YES;IMEX=1';";

            string strSQL = "SELECT * FROM [Sheet1$]";

            OleDbConnection excelConnection = new OleDbConnection(connectionString);
            excelConnection.Open();        // This code will open excel file.

            OleDbCommand dbCommand = new OleDbCommand(strSQL, excelConnection);
            OleDbDataAdapter dataAdapter = new OleDbDataAdapter(dbCommand);

            // create data table
            DataTable dTable = new DataTable();
            dataAdapter.Fill(dTable);
            dataGridView1.DataSource = dTable;

            dTable.Dispose();
            dataAdapter.Dispose();
            dbCommand.Dispose();

            excelConnection.Close();
            excelConnection.Dispose();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "Excel文件(*.xls)|*.xls";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = openFileDialog1.FileName;
                loadxls();
            }
        }