1         private void Form1_Load(object sender, EventArgs e)
2         {
3             string sql = "select * from DeptInfo";
4             this.comboBox1.DataSource = s.CHA(sql);
5             this.comboBox1.DisplayMember = "Deptname";
6             this.comboBox1.ValueMember = "DeptID";
7             int ID = int.Parse(this.comboBox1.SelectedValue.ToString());
8         }

1                 foreach (char chr in this.txtAeg.Text)
2                 {
3                     if(char.IsDigit(chr))
4                     {
5                     }
6                     else{MessageBox.Show("年龄只能为整数类型");return;};
7                 }

1         //初始化时的数据
2         private void groupBox1_Enter(object sender, EventArgs e)
3         {
4             string sql = "select BookID,BookName,BookAuthor,BookConcert,BookDates,BookCount,TypeName from TblBookInfo 　　　　　　　　　　　　　　　　　　inner join TblBookType on TblBookInfo.BookTypeID=TblBookType.ID";
5             dataGridView1.DataSource = S.CHA(sql);
6             this.label3.Text = "共有 " + (dataGridView1.RowCount-1).ToString() + " 条数据";
7             this.label2.Text = "当前时间为：" + DateTime.Now.ToString();
8             timer1.Start();
9         }

 1 　　　　　　　//选择精确查找或模糊查找
 2             string tiaojian = this.textBox1.Text;//默认精确
 3             if (radioButton2.Checked)
 4             {
 5                 tiaojian = "%" + this.textBox1.Text + "%";
 6             }
 7             //查找的字段：编号，书名，作者，类型
 8             string ziduan = "";
 9             switch (comboBox1.SelectedIndex)
10             {
11                 case 0:
12                     ziduan = "BookID like'" + tiaojian +"'";
13                     break;
14                 case 1:
15                     ziduan = "BookName like'" + tiaojian + "'";
16                     break;
17                 case 2:
18                     ziduan = "BookAuthor like'" + tiaojian + "'";
19                     break;
20                 case 3:
21                     ziduan = "TypeName like'" + tiaojian + "'";
22                     break;
23             }
24             string sql = "select BookID,BookName,BookAuthor,BookConcert,BookDates,BookCount,TypeName from TblBookInfo 　　　　　　　　　　　　　　　　　　inner join TblBookType on TblBookInfo.BookTypeID=TblBookType.ID where "+ziduan;
25             dataGridView1.DataSource = S.CHA(sql);
26             this.label3.Text = "共有 " + (dataGridView1.RowCount - 1).ToString() + " 条数据";
27         }

1　　　　　　　 if (radioButton3.Checked)
2             {
3                 //获得，年，月，日
4                 string r1 = dateTimePicker3.Value.ToShortDateString();
5                 string r2 = dateTimePicker2.Value.ToShortDateString();
6                 //日期的模糊查找
7                 sqlc = string.Format("select * from biao2 where riqi>='{0}' and riqi<='{1}'", r1,r2);
8             }

1         //加载时
2         private void Form3_Load(object sender, EventArgs e)
3         {
4             this.textBox3.ReadOnly = true;
5             this.dateTimePicker3.Enabled = false;
6             this.dateTimePicker2.Enabled = false;
7         }

 1         //加载时打开计时器
 2         private void Form1_Load(object sender, EventArgs e)
 3         {
 4             timer1.Start();
 5         }
 6         //调计时器的Interval属性，每两秒执行一次
 7         private void timer1_Tick(object sender, EventArgs e)
 8         {
 9             frmxx f = new frmxx();
10             f.Show();       //打开另一个窗体
11             timer1.Stop();  //然后关掉计时器
12         }

 1         //上一条，下一条
 2         public void xiayi(int i)
 3         {
 4             this.comboBox1.SelectedIndex = i;  //返回或设置哪个选项被选取,组合框现行选中项,索引
 5             //根据索引，和列取得表中的值
 6             this.textBox2.Text = this.dataGridView1.Rows[i].Cells[1].Value.ToString();
 7             this.textBox3.Text = this.dataGridView1.Rows[i].Cells[2].Value.ToString();
 8             this.textBox4.Text = this.dataGridView1.Rows[i].Cells[6].Value.ToString();
 9             this.textBox5.Text = this.dataGridView1.Rows[i].Cells[7].Value.ToString();
10             this.textBox6.Text = this.dataGridView1.Rows[i].Cells[3].Value.ToString();
11             this.textBox7.Text = this.dataGridView1.Rows[i].Cells[5].Value.ToString();
12             this.textBox8.Text = this.dataGridView1.Rows[i].Cells[4].Value.ToString();
13         }
14         //第一条
15         private void button2_Click(object sender, EventArgs e)
16         {
17             xiayi(0);//索引为0
18         }
19         //最后一条
20         private void button5_Click(object sender, EventArgs e)
21         {
22             //先获得表中的行数，减去一个无数据行，索引从0开始的所以再减一
23             int z = dataGridView1.Rows.Count-2;
24             xiayi(z);
25         }
26         //上一条
27         private void button3_Click(object sender, EventArgs e)
28         {
29             //上一条，也就是索引减一
30             int i = this.comboBox1.SelectedIndex-1;
31             //当索引减到小于0时，将索引赋值为最大
32             if (i<0)
33             {
34                 i = dataGridView1.Rows.Count-2;
35             }
36             xiayi(i);
37         }
38         //下一条
39         private void button4_Click(object sender, EventArgs e)
40         {
41             int i = this.comboBox1.SelectedIndex + 1;
42             //当索引增加到最大值时，将索引赋值为0
43             if (i > dataGridView1.Rows.Count - 2)
44             {
45                 i = 0;
46             }
47             xiayi(i);
48         }