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            try
            {
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }

using System.Data.Sql;
using System.Data.SqlClient;

        SqlConnection pConn;
        SqlDataAdapter pAdpt;
        SqlCommand pCom;
        string pConnstr;
        string pSQL;
        DataSet ds = new DataSet();

pConnstr = "Data Source = 計算機名;Initial Catalog=數據庫名;Integrated Security=True";
                if (pConn == null) pConn = new SqlConnection(pConnstr);
                if (pConn.State == ConnectionState.Closed)
                {
                    pConn.Open();　　　　　　　　　　　　
                }　　　　　　　　　　MessageBox.Show("連接成功");

　　　　　　　　　　pConn.Close();

                pSQL = "select * from 表名 where 列名 = 值";
                pCom = new SqlCommand(pSQL, pConn);
                pAdpt = new SqlDataAdapter(pCom);
                pAdpt.Fill(ds, "result");
                pCom.executeNonQuery();
　　　　　　　　dataGridView1.DataSource = ds.Tables[0]; 
　　　　　　　　dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;

                string filename = "";
                OpenFileDialog OFD = new OpenFileDialog();
                OFD.InitialDirectory = System.Windows.Forms.Application.StartupPath;
                OFD.Filter = "(*.xls)|*.xls";
                if (OFD.ShowDialog() == DialogResult.OK)
                {
                    if (OFD.FileName.Contains("表") )
                        filename = OFD.FileName;
                    else
                    {
                        if (MessageBox.Show("請確認是否選的導入表？", "導入表提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                            filename = OFD.FileName;
                    }
                }
                textBox1.Text = filename;

                SaveFileDialog SFD = new SaveFileDialog();
                SFD.InitialDirectory = System.Windows.Forms.Application.StartupPath;
                SFD.Filter = "導出表文件 (*.xls)|*.xls|(*.xlsx)|*.xlsx";
                if (SFD.ShowDialog() == DialogResult.OK)
                {
                    if (SFD.FileName.Contains("導出"))
                        textBox2.Text = SFD.FileName;
                    else
                    {
                        if (MessageBox.Show("請確認是否選的導出表？", "導出表提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                            textBox2.Text = SFD.FileName;
                    }
                }

checkBox1.Checked = false;//狀態變為不勾選
comboBox1.selectedIndex = 0;//顯示comboBox1的第一項
comboBox1.Text = "";//清空comboBox1
for (int i = checkedListBox1.Items.Count - 1; i >= 0; i--)
 { checkedListBox1.SetItemChecked(i, false); }
//將checkedListBox1中所有checkBox狀態變為未勾選

不指定插入：
insert INTO table_name
VALUES (value1,value2,value3,...);
指定列名插入語句：
insert INTO table_name (column1,column2,column3,...)
VALUES (value1,value2,value3,...);

delete from 表名稱 where 列名稱 = 值

delete * from table_name

select * from 表名 where 列名 = 值

update 表名稱 SET 列名稱 = 新值 where 列名稱 = 某值