1、 static void Main(string args) Console.WriteLine(输入一个字符串); string s = Console.ReadLine(); string s1; /* s1 = s.Substring(2, 2); s1 = s.Remove(2, 3); s1 = s.Insert(3, 123 s1 = s.Replace(abcd, ABCD char s2 = s.ToCharArray(2,3 ); for (int i = 0; i s.Length; i+) Console.WriteLine(s2i); int i = 98765; s1
2、 = i.ToString(); s1 = s.ToUpper(); string s3 = s.Split(q Console.WriteLine(s30); Console.WriteLine(s31); */ Console.WriteLine(s1); C#用户登陆界面using System.ComponentModel;using System.Data;using System.Drawing;using System.Windows.Forms;using System.Data.OleDb;namespace 联系 public partial class Form1 : F
3、orm public Form1() InitializeComponent(); private void Form1_Load(object sender, EventArgs e) private void button1_Click(object sender, EventArgs e) string s = Provider=Microsoft.Jet.OLEDB.4.0;Data Source=密码.mdb; OleDbConnection conn = new OleDbConnection(s); string sql = select* from mima where id=
4、 + textBox1.Text + and mi= + textBox2.Text + OleDbDataAdapter oda = new OleDbDataAdapter(sql, conn); DataSet ds = new DataSet(); oda.Fill(ds, tablet1 if (ds.Tables0.Rows.Count = 1) MessageBox.Show(登录成功! else登录失败abcdefg,MessageBoxButtons.YesNo,MessageBoxIcon.Question); private void button1_Click()C#与
5、ACCESS 数据库连接应用namespace T3Data Source=123.mdb /- string Sql = select * from Student OleDbDataAdapter oda = new OleDbDataAdapter(Sql, conn); /-t1 /- dataGridView1.DataSource = ds.Tables; private void button2_Click(object sender, EventArgs e)select * from Student where ID=+textBox1 .Text+ private void
6、 button3_Click(object sender, EventArgs e) sjb sjb1 = new sjb();select * from Student where Sex= dataGridView1.DataSource = sjb1.getsjb(sql); private void button4_Click(object sender, EventArgs e) sjb sjb2 = new sjb();delete from Student where ID= + textBox3.Text + dataGridView1.DataSource = sjb2.getsjb(sql); private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
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