决定将一些简单的程序放在这里.可能很简单,但是要备忘.是今后学习的参考.主要还是积累.
  1:一段简单的控制台程序

 static void Main(string[] args)
        {
            bool b = SearchString();
            Console.WriteLine("The result is "+b);
        }
        public static bool SearchString()
        {
            string FileContent;
            //打开文件
            System.IO.FileStream mystream = new System.IO.FileStream("D:\\test.txt", System.IO.FileMode.Open);
            System.IO.StreamReader mystreamReader = new System.IO.StreamReader(mystream);
            //读取文件

            FileContent = mystreamReader.ReadToEnd();
            //查询特定的词汇
            int ind = FileContent.IndexOf("work");
            if (ind>0)
                return true;
            else
                return false;
            //关闭
            mystreamReader.Close();

2:一段简单的数据库操作

 private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.InitialDirectory = @"C:\Program files\";
            openFileDialog1.Filter = "mdb files(*.mdb)|*.mdb|All files(*.*)|*.*";
            openFileDialog1.FileName = "";
            openFileDialog1.FilterIndex = 2;
            openFileDialog1.RestoreDirectory = true;

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

        private void button2_Click(object sender, EventArgs e)
        {
            //OleDbConnection conn = new OleDbConnection();
            //string str = "Provider=Microsoft.Jet.Oledb.4.0;Data Source=" + textBox1.Text + "; " + "User ID=admin;Jet OLEDB:database Password=gongdiansuo;Persist Security Info=true";
            //OleDbConnection conn = new OleDbConnection(str);
            //string sql = "UPDATE a30 SET 表号 = 出厂编号;";
            //OleDbCommand cmd = new OleDbCommand(sql,conn);
            //conn.Open();
            if (textBox1.Text == "")
            {
                MessageBox.Show("请选择数据库所在的位置", "info");
            }
            else
            {
                string str = "Provider=Microsoft.Jet.Oledb.4.0;Data Source=" + textBox1.Text + "; " + "User ID=admin;Jet OLEDB:database Password=gongdiansuo;Persist Security Info=true";
                OleDbConnection conn = new OleDbConnection(str);
                string sql = "UPDATE a30 SET 表号 = 出厂编号;";
                OleDbCommand cmd = new OleDbCommand(sql, conn);
                //conn.Open();
                if (checkBox1.Checked)
                {
                    try
                    {
                        conn.Open();
                        cmd.ExecuteNonQuery();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                    finally
                    {
                        conn.Close();
                        MessageBox.Show("update successfully", "info", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                 if(checkBox2.Checked)
                {
                   
                    string insert = "UPDATE A30 SET A30.[日光灯(kW)] = @light, A30.[日光灯(数量)] = @lightnum, A30.[电视机(kW)] = @tv, A30.[电视机(数量)] = @tvnum;";
                    OleDbCommand cmd1 = new OleDbCommand(insert, conn);
                    cmd1.Parameters.AddWithValue("@light", textBox2.Text);
                    cmd1.Parameters.AddWithValue("@lightnum",textBox3.Text);
                    cmd1.Parameters.AddWithValue("@tv",textBox4.Text);
                    cmd1.Parameters.AddWithValue("@tvnum",textBox5.Text);

                    try
                    {
                        conn.Open();
                        cmd1.ExecuteNonQuery();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                    finally
                    {
                        conn.Close();
                        MessageBox.Show("insert successfully", "info", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }

                }
                else
                {
                    MessageBox.Show("未选择任何操作", "info", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
            }
            

        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void checkBox2_CheckedChanged(object sender, EventArgs e)
        {
            if (textBox2.Enabled == false)
                textBox2.Enabled = true;
            else
                textBox2.Enabled = false;

            if (textBox3.Enabled == false)
                textBox3.Enabled = true;
            else
                textBox3.Enabled = false;

            if (textBox4.Enabled == false)
                textBox4.Enabled = true;
            else
                textBox4.Enabled = false;

            if (textBox5.Enabled == false)
                textBox5.Enabled = true;
            else
                textBox5.Enabled = false;
            
        }